Automatic pool chlorinators range from tablet feeders that connect to pool plumbing to saltwater systems that generate chlorine from salt. My best overall pick is the Hayward CL200 In-Line Automatic Chlorine Feeder for buyers seeking a familiar, dedicated inline feeder; the Pentair Rainbow 320 stands out as another established feeder design, while the Intex Krystal Clear Saltwater System offers a different approach for compatible above-ground pools. The main choice is between plumbing fit and tablet handling on one side, and the upfront system changes and operating needs of salt chlorination on the other. Capacity, pool size, installation layout, and maintenance also separate these options. Read on for the full breakdown and guidance on matching a chlorinator to your pool.
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Key Takeaways
- The lineup splits into two approaches: most picks feed chlorine or bromine tablets, while the two Intex systems use saltwater chlorination and suit compatible above-ground pools.
- The Hayward CL200 is the all-around inline choice in this roundup; the Hayward CL200EF and XtremepowerUS offline feeder are better matches when the plumbing layout calls for a bypass installation.
- Capacity changes how often a feeder needs attention, not whether it fits: a 9-pound chamber may suit a larger or more demanding setup, but plumbing compatibility and the correct tablet type still come first.
- Pentair’s Rainbow 320 and Rainbow 300 are distinct options for buyers considering inline feeding, while the E-cowlboy model is presented as a compatible alternative for Rainbow 320 installations.
- The Intex saltwater models are not direct substitutes for tablet feeders: choose them only if pool size, equipment, salt requirements, and installation instructions match your setup.
| Inline Automatic Pool Chlorinator for Hayward CL2002S, 9 lb Capacity |  | Best Replacement Feeder | Model: CL2002S | Manufacturer: FOREBEN | Capacity: 9 lb | VIEW LATEST PRICE | See Our Full Breakdown |
| Swimline Hydrotools 87501 Automatic In-Line Chlorine Feeder, 4.2 lb Capacity |  | Best for Lower-Volume Setups | Brand: Swimline Hydrotools | Model: 87501 | Capacity: 4.2 lb | VIEW LATEST PRICE | See Our Full Breakdown |
| XtremepowerUS Inline Automatic Pool Chlorinator Feeder for 3-Inch Tablets |  | Best for 3-Inch Tablet Users | Brand: XtremepowerUS | Model: 90157 | Installation: Inline in the pool water return line | VIEW LATEST PRICE | See Our Full Breakdown |
| Hayward CL200 In-Line Automatic Chlorine Feeder for Pools |  | Best for Flexible Tablet Sizes | Brand: Hayward | Model: CL200 | Item type: In-line automatic chemical feeder | VIEW LATEST PRICE | See Our Full Breakdown |
| Hayward CL200EF Automatic Chlorine Feeder for In-Ground Pools |  | Best Offline Feeder | Brand: Hayward | Model: CL200EF | Type: Automatic chlorine feeder | VIEW LATEST PRICE | See Our Full Breakdown |
| U.S. Pool Supply In-Line Automatic Pool Chlorine Feeder, 9 lb |  | Best for Visible Refill Tracking | Chemical capacity: 9 lb (4 kg) | Compatible chemicals: Slow-dissolving trichlor or bromine tablets or sticks | Installation type: In-line | VIEW LATEST PRICE | See Our Full Breakdown |
| Intex Krystal Clear Saltwater System for Above-Ground Pools up to 8,500 Gallons |  | Best Saltwater Option for Smaller Above-Ground Pools | Model: 26687EG | Pool capacity: Up to 8,500 gallons | Required pump flow rate: 700–3,200 gph | VIEW LATEST PRICE | See Our Full Breakdown |
| Pentair Rainbow 320 Automatic In-Line Chlorine/Bromine Feeder |  | Best Established In-Line Fit for Pools and Spas | Model: R171096 | Compatible use: Pools and spas | Installation: In-line return line | VIEW LATEST PRICE | See Our Full Breakdown |
| Pentair R171016 Rainbow 300 Automatic Pool and Spa Feeder |  | Best Off-Line Feeder for Flexible Placement | Model: R171016 | Type: Off-line chlorine/bromine feeder | Dimensions: 14.75 x 22.25 x 23 inches | VIEW LATEST PRICE | See Our Full Breakdown |
| E-cowlboy R171096 In-Line Pool Chlorinator, Compatible with Pentair Rainbow 320, for 6,500–70,000 Gallons |  | Best Replacement-Style Feeder with Installation Fittings | Model: R171096 | Compatibility: Pentair R171096 and Rainbow 320 | Material: ABS plastic | VIEW LATEST PRICE | See Our Full Breakdown |
| XtremepowerUS Automatic Offline Chlorinator Feeder for Pools |  | Best for Small Pools | Installation type: Offline | Tablet compatibility: 3-inch slow-dissolving chlorine or bromine tablets | Capacity: 9 lbs | VIEW LATEST PRICE | See Our Full Breakdown |
| Hayward CL220EF Off-Line Chemical Feeder, 9 lb Capacity |  | Best Offline Feeder for Easy Access | Model: CL220EF | Type: Off-line automatic chemical feeder | Capacity: 9 lb | VIEW LATEST PRICE | See Our Full Breakdown |
| Swimline Hydrotools 8750 In-Line Automatic Chlorine Feeder |  | Best In-Line Replacement Option | Model: 8750 | Type: In-line automatic chlorine feeder | Capacity: 9.0 lbs | VIEW LATEST PRICE | See Our Full Breakdown |
| Intex Krystal Clear QS400 Saltwater Pool Chlorine System |  | Best Saltwater Option for Compact Above-Ground Pools | Model: 26663EG | Pool capacity: Up to 4,500 gallons | Required pump flow rate: 300–1,000 GPH | VIEW LATEST PRICE | See Our Full Breakdown |
| Hayward CL2002S In-Line Automatic Chlorine Chemical Feeder |  | Best for Pools and Spas | Model: CL2002S | Type: In-line automatic chemical feeder | Compatible chemicals: Trichlor or bromine tablets or sticks | VIEW LATEST PRICE | See Our Full Breakdown |
| automatic pool chlorinator | Model |
|---|---|
| Inline Automatic Pool Chlorina | CL2002S |
| Swimline Hydrotools 87501 Auto | 87501 |
| XtremepowerUS Inline Automatic | 90157 |
| Hayward CL200 In-Line Automati | CL200 |
| Hayward CL200EF Automatic Chlo | CL200EF |
| U.S. Pool Supply In-Line Autom | — |
| Intex Krystal Clear Saltwater | 26687EG |
| Pentair Rainbow 320 Automatic | R171096 |
| Pentair R171016 Rainbow 300 Au | R171016 |
| E-cowlboy R171096 In-Line Pool | R171096 |
| XtremepowerUS Automatic Offlin | 90156 |
| Hayward CL220EF Off-Line Chemi | CL220EF |
| Swimline Hydrotools 8750 In-Li | 8750 |
| Intex Krystal Clear QS400 Salt | 26663EG |
| Hayward CL2002S In-Line Automa | CL2002S |
More Details on Our Top Picks
Inline Automatic Pool Chlorinator for Hayward CL2002S, 9 lb Capacity
This FOREBEN CL2002S replacement is the most targeted choice here: it is designed to replace that Hayward model, connects to 2-inch PVC, and holds 9 pounds of slow-dissolving tablets. Its adjustable dial offers a way to regulate feed from OFF to FULL, while the larger capacity means fewer refill interruptions than the 4.2-pound Swimline Hydrotools 87501. The tradeoff is installation: this feeder must be glued into compatible plumbing, so it is a better fit for a planned replacement or plumbing project than a quick add-on. It accepts trichlor or bromine tablets, not arbitrary pool chemicals, and the pump must be off with the dial set to OFF before opening. Buyers seeking an offline layout should compare it with the Hayward CL200EF instead.
Pros:- Designed as a replacement for the Hayward CL2002S
- 9-pound capacity reduces refill frequency compared with the 4.2-pound Swimline Hydrotools 87501
- Adjustable feed dial ranges from OFF to FULL
- Compatible with pools and spas, including above-ground and in-ground setups
Cons:- Requires 2-inch PVC and a glued inline installation
- Limited to slow-dissolving trichlor or bromine tablets
- Opening requires the pump to be off and the dial set to OFF
Best for: Pool owners replacing a Hayward CL2002S who have 2-inch PVC return plumbing and want a 9-pound inline tablet feeder.
Not ideal for: Owners who need an offline feeder, lack 2-inch PVC, or want to avoid cutting and gluing pool plumbing.
- Model:CL2002S
- Manufacturer:FOREBEN
- Capacity:9 lb
- Connection:2-inch slip/socket
- Recommended flow rate:50–90 GPM
- Compatible chemicals:Slow-dissolving trichlor or bromine tablets
- Installation:Inline; bonds to PVC piping with glue
- Warranty:36 months
Our verdict“Choose this replacement when your plumbing matches the CL2002S setup and you want a high-capacity inline feeder rather than an offline model.”
Swimline Hydrotools 87501 Automatic In-Line Chlorine Feeder, 4.2 lb Capacity
The Swimline Hydrotools 87501 suits owners who prefer a smaller tablet load over the longer refill interval of a 9-pound feeder. Its 4.2-pound capacity is notably below the XtremepowerUS 90157 and FOREBEN CL2002S, both of which hold 9 pounds, so it may make more sense where a compact feed setup is preferable or sanitizer demand is modest. An adjustable output dial and connections for 2-inch plumbing let it work with an existing pump and filter system, while the reinforced thermoplastic body is described as corrosion- and UV-resistant. The tradeoff is more frequent replenishment than the larger options, and the listed data does not give a tablet capacity advantage for a high-demand pool. Chlorine and bromine must not be mixed in the feeder.
Pros:- Adjustable output dial allows feed-rate changes
- Works with existing pool pump and filter equipment
- Reinforced thermoplastic construction is described as corrosion- and UV-resistant
- Supports above-ground and in-ground pools
Cons:- 4.2-pound capacity means more frequent refills than 9-pound feeders
- Requires 2-inch inlet and outlet connections
- Chlorine and bromine must not be mixed, and compatible slow-dissolving tablets or rods are required
Best for: Owners of pools or spas with modest sanitizer demand who want an adjustable inline feeder connected to existing 2-inch equipment.
Not ideal for: Owners seeking fewer refills or a large-capacity feeder; the 4.2-pound load is smaller than the 9-pound FOREBEN and XtremepowerUS options.
- Brand:Swimline Hydrotools
- Model:87501
- Capacity:4.2 lb
- Inlet and outlet connections:2 inches
- Compatible chemicals:Chlorine or bromine; do not mix
- Compatibility:Above-ground and in-ground pools; uses existing pump and filter
- Material:Reinforced thermoplastic
Our verdict“Pick the Hydrotools 87501 for a smaller-capacity inline setup, but choose a 9-pound feeder if reducing refill frequency matters more.”
XtremepowerUS Inline Automatic Pool Chlorinator Feeder for 3-Inch Tablets
For owners who already use 3-inch slow-dissolving tablets, the XtremepowerUS 90157 makes tablet compatibility its clearest distinction. The 9-pound tank matches the capacity of the FOREBEN CL2002S replacement, but this model is specified for above-ground and small in-ground pools, rather than standing out as a direct replacement for a named feeder. Its adjustable dial meters chlorine or bromine as water circulates through the return line, and the UV-resistant ABS resin is intended for outdoor pool conditions. That inline placement is also its main constraint: the unit has to be fitted into the return plumbing after the heater and filter. Tablets are not included, and the listed maximum pressure is 50 PSI, so buyers should check their system requirements before choosing it over the more replacement-focused FOREBEN.
Pros:- Designed for slow-dissolving 3-inch chlorine or bromine tablets
- 9-pound tank capacity
- Adjustable dial controls feed rate
- UV-resistant ABS resin and compatibility with above-ground and small in-ground pools
Cons:- Requires installation in the pool return line
- Tablets are sold separately
- Specified maximum pressure is 50 PSI, which buyers must compare with their system
Best for: Owners of above-ground or small in-ground pools who use 3-inch tablets and can install a feeder in the return line.
Not ideal for: Owners who need an offline feeder, do not use 3-inch tablets, or want tablets included with the unit.
- Brand:XtremepowerUS
- Model:90157
- Installation:Inline in the pool water return line
- Tablet size:3 inches
- Tank capacity:9 lb
- Control:Adjustable dial valve
- Maximum pressure:50 PSI
- Material:Heavy-duty, UV-resistant ABS resin
- Pool compatibility:Above-ground and small in-ground pools
Our verdict“Choose this model if your pool uses 3-inch tablets and its inline return-line installation fits your plumbing.”
Hayward CL200 In-Line Automatic Chlorine Feeder for Pools
The Hayward CL200 stands out for accepting large or small slow-dissolving tablets, giving it more tablet-size flexibility than the XtremepowerUS 90157, which is specified for 3-inch tablets. Its adjustable dial controls feed, and the Easy-Lok cover with a finger-release catch is designed to make access more convenient while keeping the lid secured. The feeder connects to a pool or spa pump and filter system, so it suits owners who want an inline arrangement rather than the offline installation of the Hayward CL200EF. The supplied product data does not state a capacity, however, making it harder to compare refill intervals with the 9-pound FOREBEN or XtremepowerUS. Buyers should also account for the plumbing connection; this is not a standalone dispenser that can simply sit beside the pool.
Pros:- Accepts large or small slow-dissolving trichlor or bromine tablets
- Adjustable dial controls feed rate
- Easy-Lok cover and finger-release catch provide convenient access
- Compatible with pool or spa pump and filter systems
Cons:- Requires connection to a pump and filter system
- Product data does not state capacity, limiting refill-interval comparisons
- Inline configuration is unsuitable for buyers needing an offline layout
Best for: Pool or spa owners who want a Hayward inline feeder that accepts either large or small slow-dissolving tablets.
Not ideal for: Buyers who need a stated capacity to plan refill frequency or whose plumbing setup calls for an offline feeder.
- Brand:Hayward
- Model:CL200
- Item type:In-line automatic chemical feeder
- Compatible tablets:Slow-dissolving trichlor or bromine tablets, large or small
- Feed control:Adjustable dial
- Body material:ABS
- Seal material:Viton
- Item weight:4 ounces
Our verdict“Choose the CL200 if tablet-size flexibility and a Hayward inline setup matter more than a clearly stated capacity.”
Hayward CL200EF Automatic Chlorine Feeder for In-Ground Pools
The Hayward CL200EF is the choice in this group for an offline plumbing configuration, making it a different fit from the inline CL200 and the FOREBEN CL2002S replacement. Its 9-pound capacity and adjustable feed control address two practical needs: holding a substantial tablet load and giving owners a way to regulate output. It is specified for in-ground pools, so it is a more focused pick than feeders described for both above-ground and in-ground use. The tradeoff is that offline installation must match the pool’s plumbing layout and follow manufacturer recommendations; this is not the straightforward choice for someone replacing an inline unit. The available product data identifies chlorine tablets, rather than the broader chlorine-or-bromine compatibility listed for several alternatives, so buyers seeking bromine use should verify suitability before purchasing.
Pros:- Offline configuration provides an alternative to inline feeders such as the Hayward CL200
- 9-pound capacity can reduce refill frequency
- Adjustable feed control regulates sanitizer output
- Designed for in-ground pool environments
Cons:- Offline plumbing configuration may not suit an existing inline setup
- Installation should follow manufacturer recommendations
- Product data specifies chlorine tablets and does not list bromine compatibility
Best for: In-ground pool owners whose plumbing calls for an offline feeder and who want 9-pound capacity with adjustable chlorine output.
Not ideal for: Above-ground pool owners, buyers needing an inline replacement, or those seeking clearly specified bromine compatibility.
- Brand:Hayward
- Model:CL200EF
- Type:Automatic chlorine feeder
- Installation:Offline
- Capacity:9 lb of chlorine tablets
- Pool compatibility:In-ground pools
- Control:Adjustable feed control
- Number of items:1
Our verdict“Choose the CL200EF when you have an in-ground pool with an offline layout and want a high-capacity feeder with adjustable output.”
U.S. Pool Supply In-Line Automatic Pool Chlorine Feeder, 9 lb
The transparent locking lid gives this in-line feeder a practical edge for owners who want to check tablet levels without opening the housing. Its 9 lb capacity also means fewer refills than a smaller-capacity feeder such as the Swimline Hydrotools 87501. An adjustable dial lets you change the feed rate, while the O-ring seal and included lid wrench support routine opening and closing. This model accepts slow-dissolving trichlor or bromine tablets or sticks, so it offers more chemical-format flexibility than a tablet-only setup. The tradeoff is the installation: it must be plumbed into the return line, and the tablets or sticks are not included. I’d choose it for a compatible in-line system, but not for a pool owner seeking a portable or plug-in option.
Pros:- 9 lb capacity reduces how often chemicals need replenishing
- Transparent lid makes tablet or stick levels visible
- Adjustable feed dial allows output changes
- Installation accessories and lid wrench are included
Cons:- Requires in-line plumbing installation
- Trichlor or bromine tablets and sticks are sold separately
Best for: Pool owners with an existing in-line return setup who want a large-capacity feeder and a quick visual check of remaining tablets
Not ideal for: Owners who cannot modify return-line plumbing or want a feeder that comes with treatment chemicals
- Chemical capacity:9 lb (4 kg)
- Compatible chemicals:Slow-dissolving trichlor or bromine tablets or sticks
- Installation type:In-line
- Material:ABS plastic
- Compatible chlorinator:Hayward CL200
- Included accessories:Installation accessories, instruction guide, and lid wrench
- Model number:USP CF-478
Our verdict“Choose this feeder if you have compatible return-line plumbing and value visible chemical levels alongside a generous 9 lb capacity.”
Intex Krystal Clear Saltwater System for Above-Ground Pools up to 8,500 Gallons
Unlike the Pentair Rainbow 320, which meters chlorine or bromine tablets, the Intex Krystal Clear generates chlorine from salt with an electrolytic cell. That changes the upkeep routine: rather than loading a tablet feeder, owners run the system on a schedule using its 24-hour timer. Three self-cleaning cycle choices and HydroAeration technology add operating flexibility for pools within its stated limit of 8,500 gallons. The main constraint is fit: it is intended for above-ground pools and requires a compatible filter pump with a flow rate of 700–3,200 gph, sold separately. It is not a direct substitute for a simple feeder if a pool already relies on tablets, and the pump requirement adds another compatibility check. I’d favor this system for an Intex-style above-ground setup where saltwater chlorination is the preferred approach.
Pros:- Generates chlorine from salt instead of requiring tablet loading
- 24-hour timer supports scheduled operation
- Three self-cleaning cycle options are available
- HydroAeration technology supports circulation and water clarity
Cons:- Requires a compatible filter pump, which is sold separately
- Limited to above-ground pools up to 8,500 gallons
- Uses a different maintenance approach from conventional tablet feeders
Best for: Owners of above-ground pools up to 8,500 gallons who want scheduled chlorine generation from salt and already have a compatible filter pump
Not ideal for: Owners of larger pools, in-ground pools, or systems without a compatible pump who want a straightforward tablet feeder
- Model:26687EG
- Pool capacity:Up to 8,500 gallons
- Required pump flow rate:700–3,200 gph
- Timer:24-hour
- Self-cleaning cycles:6, 10, and 14 hours
- Warranty:2-year limited
- Included component:Saltwater system
Our verdict“Pick this system for a compatible, smaller above-ground pool if you prefer salt-based chlorine generation over tablet feeding.”
Pentair Rainbow 320 Automatic In-Line Chlorine/Bromine Feeder
The Pentair Rainbow 320 earns its place for buyers who need one in-line feeder for a pool or spa and want connection options for common return-line sizes. It accepts 2-inch slip PVC and includes adapters for 1.5-inch connections, making it more adaptable at installation than a feeder with only one fitting size. Its stated capacity—11 large or 98 small tablets—also exceeds the 9 lb U.S. Pool Supply feeder by tablet count, though those capacity figures are not directly comparable by weight. The design does not require special venting. Compared with the E-cowlboy replacement, the Rainbow 320 is the named compatible model rather than a replacement-style alternative, but it does not include unions. I’d shortlist it when the specified fittings and pool-or-spa use match the plumbing plan.
Pros:- Suitable for both pools and spas
- Fits 2-inch slip PVC and includes 1.5-inch adapters
- Holds up to 11 large or 98 small tablets
- Does not require special venting
Cons:- Unions are not included
- Requires in-line return-line installation
- Uses chlorine or bromine tablets rather than generating chlorine from salt
Best for: Pool and spa owners who need an in-line tablet feeder with adapters for 1.5-inch connections and a stated large-tablet capacity
Not ideal for: Buyers who need unions included or prefer saltwater chlorine generation instead of tablet or bromine feeding
- Model:R171096
- Compatible use:Pools and spas
- Installation:In-line return line
- Fitting:2-inch slip PVC with adapters for 1.5-inch connections
- Tablet capacity:11 large or 98 small tablets
- Item weight:4.5 pounds
- Warranty:1 year
Our verdict“Choose the Rainbow 320 if its return-line fittings suit your pool or spa and you want a high-capacity in-line tablet feeder.”
Pentair R171016 Rainbow 300 Automatic Pool and Spa Feeder
The Rainbow 300 takes a different plumbing route from the in-line Rainbow 320: it is an off-line chlorine and bromine feeder, which can suit an installation where an in-line body is not the preferred fit. Its enclosed design is listed as requiring no special venting and preventing escaping gases, while NSF listing provides a clear certification detail that is not specified for the other feeders here. That said, the product data does not give a tablet capacity or adjustable feed control, so buyers comparing it with the Rainbow 320 or the E-cowlboy replacement have less information about loading frequency and dosing adjustment. It is also a relatively large unit at 14.75 x 22.25 x 23 inches, and unions are not included. I’d consider it when off-line installation is the priority, not when compact dimensions or detailed capacity information matter most.
Pros:- Off-line design offers an alternative to return-line installation
- Enclosed system is listed as preventing escaping gases
- No special venting is required
- NSF listed
Cons:- Unions are not included
- Large stated dimensions may complicate equipment-area placement
- Product data does not specify tablet capacity or adjustable feed control
Best for: Pool or spa owners who need an enclosed off-line feeder and want a model listed as NSF certified
Not ideal for: Buyers with limited equipment-space room or those who want a specified tablet capacity and adjustable flow details before choosing
- Model:R171016
- Type:Off-line chlorine/bromine feeder
- Dimensions:14.75 x 22.25 x 23 inches
- Weight:3 pounds
- Manufacturer:Pentair
- Certification:NSF listed
- Unions:Not included
Our verdict“Choose the Rainbow 300 when an enclosed off-line arrangement matters more than compact size or a published tablet-capacity figure.”
E-cowlboy R171096 In-Line Pool Chlorinator, Compatible with Pentair Rainbow 320, for 6,500–70,000 Gallons
This E-cowlboy model is aimed at owners replacing a Pentair Rainbow 320 or R171096 feeder, not shoppers choosing a chlorination method from scratch. Its capacity matches the Rainbow 320 at 11 large or 98 small tablets, while the adjustable flow control lets owners change the feed rate. The included 2-inch PVC slip fittings and 1.5-inch adapters are a practical contrast with the Pentair Rainbow 320, for which unions are not included; this product also specifies a drain plug and dual O-ring seals to support maintenance and sealing. Its stated pool range is 6,500–70,000 gallons, but compatibility with existing plumbing should still guide the choice. The tradeoff is that it remains an in-line tablet feeder, so it needs return-line installation and does not offer the salt-based operation of the Intex system.
Pros:- Capacity of up to 11 large or 98 small tablets
- Adjustable flow control supports changes to feed rate
- Includes 2-inch fittings and 1.5-inch adapters
- Drain plug and dual O-ring seals support maintenance and sealing
Cons:- Requires in-line return-line installation
- Uses chlorine or bromine tablets rather than generating chlorine from salt
- Compatibility is centered on Pentair Rainbow 320 and R171096 replacements
Best for: Owners replacing a Rainbow 320-style feeder who want adjustable feed control and included connection fittings
Not ideal for: Pool owners seeking an off-line feeder, saltwater chlorine generation, or a setup that avoids return-line plumbing
- Model:R171096
- Compatibility:Pentair R171096 and Rainbow 320
- Material:ABS plastic
- Tablet capacity:11 large or 98 small tablets
- Pool size range:6,500–70,000 gallons
- Installation fittings:2-inch PVC slip fittings and 1.5-inch adapters
- Flow control:Adjustable
- Warranty:12 months
Our verdict“Choose this replacement-style feeder if your plumbing matches the Rainbow 320 format and you want adjustable flow with fittings included.”
XtremepowerUS Automatic Offline Chlorinator Feeder for Pools
The XtremepowerUS is a practical pick when a pool owner wants tablet feeding without putting the feeder directly in the main plumbing line. Its offline installation can reduce added flow restriction, and the 9-pound capacity means fewer reloads than a smaller feeder. A dial lets you adjust the feed, while the resin tank accepts slow-dissolving 3-inch chlorine or bromine tablets. Compared with the Hayward CL220EF, it offers similar capacity and adjustable dosing, but the Hayward specifies an Easy-Lok cover and Viton seal; this model’s listed strengths are its resin construction and small-pool fit. The tradeoff is that it is recommended for above-ground and small in-ground pools, not as a clear choice for larger systems. Tablets are also sold separately, and offline installation still requires plumbing connections.
Pros:- Offline design avoids placing the feeder directly in the main flow path
- 9-pound capacity reduces how often tablets need replenishing
- Adjustable dial gives the owner control over feed rate
- Heavy-duty resin tank accepts chlorine or bromine tablets
Cons:- Recommended for small in-ground pools rather than larger pool systems
- Tablets are sold separately
- Offline installation requires connections to pool plumbing
Best for: Owners of above-ground pools or small in-ground pools who want adjustable tablet feeding while avoiding an in-line feeder.
Not ideal for: Owners of large in-ground pools or buyers who want a feeder that does not require plumbing connections.
- Installation type:Offline
- Tablet compatibility:3-inch slow-dissolving chlorine or bromine tablets
- Capacity:9 lbs
- Feed control:Adjustable dial knob
- Maximum pressure:50 PSI
- Maximum output:32 lbs/hr
- Material:Heavy-duty resin
- Suitable pools:Above-ground pools and small in-ground pools
- Model:90156
Our verdict“Choose this feeder for a small pool where offline installation and adjustable tablet dosing matter more than broad large-pool suitability.”
Hayward CL220EF Off-Line Chemical Feeder, 9 lb Capacity
The CL220EF suits owners who want the flexibility of an offline feeder with a cover designed for more convenient loading. Its Easy-Lok threaded cover, 9-pound capacity, and adjustable feed rate make routine tablet maintenance more straightforward than a basic feeder with less accessible servicing. The ABS housing and Viton seal also give this model a defined materials package, unlike the XtremepowerUS offline feeder, whose supplied details emphasize a heavy-duty resin tank and small-pool suitability. Both options hold 9 pounds and allow feed adjustment, so the decision comes down to cover and seal details versus the XtremepowerUS’s explicit fit for above-ground and small in-ground pools. This is a chemical feeder, not a saltwater system, and it requires tablets and plumbing connections. Buyers should also confirm the feeder fits their pool setup before choosing it.
Pros:- 9-pound capacity helps reduce refill frequency
- Adjustable feed rate supports dosing changes
- Easy-Lok threaded cover is designed for convenient access
- ABS housing and Viton seal are specified
Cons:- Requires chlorine tablets, which are not included in the supplied product details
- Offline setup requires pool-plumbing connections
- Does not provide saltwater chlorination or tablet-free operation
Best for: Pool owners who prefer an offline tablet feeder and value an access-oriented cover and specified seal materials.
Not ideal for: Owners seeking saltwater chlorination, a tablet-free system, or a feeder whose pool-size suitability is explicitly tailored to small pools.
- Model:CL220EF
- Type:Off-line automatic chemical feeder
- Capacity:9 lb
- Feed rate:Adjustable
- Housing material:ABS
- Seal material:Viton
- Cover:Easy-Lok threaded cover
Our verdict“Pick the CL220EF if you want an offline 9-pound feeder with an Easy-Lok cover and specified Viton seal.”
Swimline Hydrotools 8750 In-Line Automatic Chlorine Feeder
The Hydrotools 8750 is aimed at pool owners who want an in-line feeder integrated with the pump and filter system, including those replacing compatible major-brand equipment. Its 9-pound capacity and adjustable output provide the basics for steady tablet feeding, while double-reinforced thermoplastic is specified as UV- and corrosion-resistant for outdoor pool use. Unlike the XtremepowerUS offline feeder, this model sits in the plumbing flow path rather than using an offline connection, so installation fit and the existing system matter more. Its stated compatibility with above-ground and in-ground pools gives it broader listed use than the XtremepowerUS, but it does not remove the need for a plumbing connection. The product details do not specify tablet dimensions or a feed-control dial design, so buyers should verify compatibility and installation requirements before replacing an existing feeder.
Pros:- Adjustable output helps tune chlorine dispensing
- 9-pound capacity limits how often the feeder needs refilling
- Specified for above-ground and in-ground pools
- UV- and corrosion-resistant reinforced thermoplastic construction
Cons:- Must connect to the pool plumbing system
- In-line placement makes plumbing fit a key installation requirement
- Supplied details do not specify tablet dimensions
Best for: Pool owners replacing a compatible in-line feeder who want adjustable output and a 9-pound capacity for an above-ground or in-ground pool.
Not ideal for: Owners who want an offline feeder to avoid adding equipment to the main plumbing line or who need tablet compatibility details confirmed upfront.
- Model:8750
- Type:In-line automatic chlorine feeder
- Capacity:9.0 lbs
- Output:Adjustable
- Pool compatibility:Above-ground and in-ground pools
- Replacement compatibility:Designed as a replacement for major brands such as Hayward and Pentair
- Material:Double-reinforced thermoplastic
- Resistance:UV and corrosion resistant
Our verdict“Choose the Hydrotools 8750 when replacing or adding an in-line feeder is preferable to an offline setup.”
Intex Krystal Clear QS400 Saltwater Pool Chlorine System
The QS400 is the lineup’s distinct choice for owners who want saltwater chlorine generation rather than a feeder loaded with dissolving tablets. It is designed for above-ground pools up to 4,500 gallons, with a built-in 24-hour timer, three self-cleaning cycle choices, and hydroaeration technology. That changes the upkeep routine compared with the Hayward CL220EF, which dispenses tablets and does not need a compatible pump-flow range specified in its supplied details. The Intex does, however: its pump must deliver 300–1,000 GPH, and the filter pump is sold separately. The smaller pool limit also makes it a poor fit for larger pools, even though other saltwater systems in this roundup are aimed at higher capacities. No warranty is listed, so buyers should weigh that alongside the added pump requirement.
Pros:- Generates chlorine from salt rather than relying on tablet loading
- Built-in 24-hour timer supports scheduled operation
- Three self-cleaning cycle options provide operating choices
- Hydroaeration technology supports circulation, filtration, and water clarity
Cons:- Filter pump is sold separately
- Requires a compatible pump with 300–1,000 GPH flow
- Pool capacity is limited to 4,500 gallons and no warranty is listed
Best for: Owners of Intex-compatible above-ground pools up to 4,500 gallons who prefer saltwater chlorination and scheduled operation over loading tablets.
Not ideal for: Owners of larger pools, buyers without a compatible 300–1,000 GPH pump, or anyone seeking a conventional tablet feeder.
- Model:26663EG
- Pool capacity:Up to 4,500 gallons
- Required pump flow rate:300–1,000 GPH
- Timer:Built-in 24-hour timer
- Self-cleaning cycles:6, 10, or 14 hours
- Item weight:8 pounds
- Warranty:No warranty listed
Our verdict“Choose the QS400 for a compatible compact above-ground pool if saltwater operation matters more than the simplicity of a tablet feeder.”
Hayward CL2002S In-Line Automatic Chlorine Chemical Feeder
The CL2002S stands out for buyers who need one in-line chemical feeder suited to pools and spas, rather than a model described only for pool use. It accepts slow-dissolving Trichlor or bromine tablets or sticks, and its adjustable feed control lets owners regulate dispensing through a compatible pump and filter system. The 2-inch inlet and outlet ports and stated 50–90 GPM flow range make plumbing compatibility a central part of the choice. Compared with the Swimline Hydrotools 8750, which lists a 9-pound capacity and UV- and corrosion-resistant thermoplastic, the Hayward specifies chemical options, port size, and pool-and-spa compatibility. The tradeoff is that its supplied details do not state capacity, so buyers cannot compare refill intervals directly. It also requires suitable plumbing and remains limited to slow-dissolving tablets or sticks.
Pros:- Compatible with above-ground and in-ground pools and spas
- Accepts slow-dissolving Trichlor or bromine tablets or sticks
- Adjustable feed control supports dosing changes
- Easy-Lok cover provides access for adding chemicals
Cons:- Requires a compatible pump and filter system
- Limited to slow-dissolving Trichlor or bromine tablets or sticks
- Supplied specifications do not state feeder capacity
Best for: Owners of pools or spas with a compatible pump and filter system who want adjustable Trichlor or bromine tablet-or-stick feeding.
Not ideal for: Buyers who need an offline feeder, a saltwater system, or a stated capacity to estimate time between refills.
- Model:CL2002S
- Type:In-line automatic chemical feeder
- Compatible chemicals:Trichlor or bromine tablets or sticks
- Pool compatibility:Above-ground and in-ground pools and spas
- Inlet and outlet ports:2 inches
- Flow rate:50–90 GPM
- Body material:ABS
- Seal material:Viton
- Cover:Easy-Lok
Our verdict“Choose the CL2002S for a compatible pool or spa installation when its chemical flexibility and 2-inch ports fit your system.”
How We Picked
I compared these automatic pool chlorinators by the job they do and the pool setups they can reasonably serve, rather than treating every product as interchangeable. The ranking weighs feeder type, stated capacity or pool-size range, installation approach, intended use, and how clearly the product fits common buyer needs. I also considered practical ownership factors: how much plumbing work may be involved, whether a model is aimed at an above-ground pool, and what maintenance its operating method implies.
The order gives priority to options with a clear use case and broad relevance, then places more specialized, layout-dependent, or compatibility-dependent products later. Inline and offline tablet feeders are compared separately from saltwater systems because they use different equipment and care routines. Product names and listed specifications guide this roundup; buyers should confirm current manufacturer instructions, connections, and pool compatibility before purchasing.
Factors to Consider When Choosing Automatic Pool Chlorinators
Before choosing a model, match the chlorinator to the pool’s equipment and your preferred way of adding sanitizer. A feeder that looks suitable on capacity alone can still require the wrong plumbing arrangement, tablet type, or pool conditions. These checks help narrow the field without treating tablet feeders and salt systems as equivalent.
Choose Between Tablets and Saltwater Chlorination
Tablet feeders hold sanitizer and meter it into circulating water, while saltwater systems use a cell to produce chlorine from dissolved salt. The two approaches create different ownership routines: tablet users replenish chemicals and keep the feeder clean, while salt-system owners follow salt, cell, and system-maintenance requirements. Do not assume a saltwater system is chemical-free or that it will work with any pool equipment. Check the pool manufacturer’s guidance, system capacity, and salt requirements before buying. A buyer replacing a tablet feeder may prefer a like-for-like unit; changing methods can involve additional setup and ongoing care.
Confirm Inline or Offline Plumbing Fit
An inline feeder connects directly into the return plumbing, so its connection size, space, and installation position matter. An offline feeder sits beside the main pipework and uses tubing to connect to the circulation system, which can help when a direct inline installation is impractical. Measure the available area and identify the pipe arrangement before selecting a style. Avoid assuming that a model’s brand name means it will fit existing connections without adapters or changes. If you are unsure about cutting or modifying pool plumbing, review the installation instructions or ask a qualified pool professional.
Size Capacity for Your Routine, Not Just Pool Volume
A larger chamber can hold more tablets between refills, but chamber capacity alone does not tell you how much sanitizer a pool needs. Pool volume, circulation, weather, swimmer use, and water testing all affect demand. Treat listed pool-size ranges as a starting point, then check the manufacturer’s sizing directions for your actual conditions. A common mistake is buying the largest feeder available and assuming it will regulate chlorine without monitoring. Choose a capacity that suits your maintenance schedule while continuing to test and adjust water chemistry.
Check Tablet Compatibility and Safe Handling
Confirm which sanitizer the feeder accepts before loading it; chlorine and bromine products are not automatically interchangeable across every device. Some products in this roundup are specifically described for 3-inch tablets, while others have different stated uses. Read the product and chemical labels, and follow the feeder’s directions for loading, adjustment, and storage. Never mix different chemicals in a feeder or combine residues from incompatible products. If you already have a supply of tablets, verify compatibility before choosing a unit rather than trying to make an unsuitable feeder work.
Account for Maintenance and Pool Conditions
Every chlorination method needs regular attention, but the tasks differ. Tablet feeders need inspection for buildup, leaks, and worn seals, while saltwater systems require care of the cell and monitoring of salt and water chemistry according to the maker’s instructions. Pool size is only one part of fit; above-ground equipment, circulation setup, and the system’s stated limits also matter. Review replacement-part availability and service instructions before purchase, especially if you plan to keep the unit through multiple seasons. A low-effort routine still depends on testing the water rather than relying on automation alone.
Decide When a Higher-Capacity or Specialized Model Is Worth It
Paying for a larger chamber or specialized configuration makes sense when it solves a real constraint, such as fewer refill visits or a plumbing layout that calls for an offline feeder. It is less useful when the unit is oversized for the pool or incompatible with existing equipment. A compatible replacement can simplify a repair, but verify the exact model relationship and connections rather than relying on appearance. Saltwater systems may suit buyers who prefer that operating method, yet they call for a separate review of pool compatibility and maintenance. Rank the benefits by how your pool is installed and maintained, not by feature count alone.
Frequently Asked Questions
Can I replace my existing feeder with any model from this list?
No. Replacement depends on whether the existing unit is inline or offline, its plumbing connections, available installation space, and the sanitizer it is designed to handle. Even products with similar names or capacities may not use the same fittings or installation method. Compare the old unit’s model details with the new product’s specifications and installation instructions. If the plumbing has been modified, check the actual pipe layout rather than relying only on the original equipment label.
Should I choose an inline or offline chlorinator for an older pool setup?
Start with the pool’s current plumbing and the space around the return line. An inline feeder connects into the main plumbing, while an offline model uses separate connections and may suit a layout where a direct installation is difficult. Older systems can have nonstandard pipe sizes or limited clearance, so measurements matter more than a general preference for one style. Check installation requirements before ordering, and get qualified help if the work involves cutting or changing pressurized pool plumbing.
Can a saltwater system replace a tablet feeder without other changes?
Not necessarily. Saltwater chlorination relies on a compatible system and pool setup, and it has salt and cell requirements that a tablet feeder does not. Confirm the pool’s size and equipment compatibility, then follow the system maker’s instructions for installation and water conditions. You may also need to change your maintenance routine and monitor the system’s cell and salt levels. A salt system is a different chlorination approach, not simply a tablet feeder with a different refill.
Does a 9-pound feeder mean I can stop checking chlorine levels as often?
No. Chamber capacity describes how much product the feeder can hold, not the pool’s exact sanitizer demand or the water’s current condition. Sun exposure, water temperature, circulation, and pool use can change chlorine needs. Continue testing water and adjust the feeder according to its instructions and test results. A larger capacity may reduce how often you refill, but it does not replace water testing or routine inspection.
Are chlorine and bromine tablets interchangeable in these feeders?
Do not assume they are. The Pentair Rainbow 320 is described for chlorine or bromine, but other products may specify a particular tablet type or intended use. Check the exact feeder’s instructions and the chemical label before loading it. Never mix different sanitizer products or add one product on top of residue from an incompatible chemical. When the permitted tablet type is unclear, confirm it with the manufacturer before use.
Conclusion
Best overall: I’d start with the Hayward CL200 if an inline tablet feeder matches your plumbing. Best value-oriented alternatives: compare the Swimline Hydrotools 87501 or U.S. Pool Supply 9 lb feeder against your connection needs and capacity preferences. Best premium-style choice: the Pentair Rainbow 320 stands out for buyers seeking an established inline feeder with chlorine-or-bromine use stated in its listing. Best for beginners: choose the product whose installation style and chemical instructions most closely match your existing setup, rather than switching systems for convenience alone. Best for specific needs: consider the Hayward CL220EF or XtremepowerUS offline feeder for a bypass-style layout, and the Intex saltwater systems only for compatible above-ground pools. Confirm fit, sanitizer compatibility, and pool limits before deciding.
