Keeping an inground pool at the right sanitizer level is essential for clear water and enjoyable swimming. Automatic chlorinators feed chlorine or bromine tablets automatically, reducing guesswork and daily testing. This guide highlights five top options that balance reliability, installation ease, and compatibility with common Rainbow and Hayward systems. Both inline and offline designs are covered, so you can pick the model that best fits your pool layout and maintenance preferences. The selections below emphasize solid construction, adjustable dosing, and straightforward installation for American pools.
| Product | Brand | Type | Notes |
|---|---|---|---|
| Pentair Rainbow 320 Inline Feeder | Pentair | Inline | Permanent installation in return line; 2″ slip PVC with adapters for 1-1/2″ piping; compatible with Rainbow 320 |
| XtremepowerUS Inline Chlorinator | XtremepowerUS | Inline | 9-lb tank; dial control; heavy-duty resin; designed for inline installation after heater and filter |
| CL200 In-Line Chlorinator | Edovaf | Inline | 2″ fittings; adjustable feed rate; finger release latch; compatible with inline Hayward CL200 applications |
| R171016 Rainbow 300 Compatible Feeder | Gartu | Offline | Integrated base; optimized control valve; 72,000 gallon capacity; durable construction |
| 320 Pool Chlorinator Vikua | Vikua | Inline | Rainbow 320 compatible; vent plug; drain; 11 large or 98 small tablets; large capacity ranges |
Pentair Rainbow 320 Inline Feeder
The Pentair Rainbow 320 inline feeder is designed for permanent installation in the pool return line, enabling steady delivery of sanitizers directly into the water flow. It eliminates the need to constantly monitor inline dosing and integrates with Rainbow 320 systems for streamlined operation. Its inline design minimizes additional equipment in the filtration loop, helping maintain proper water movement through the heater, filter, and feeder.
Key installation points include a standard 2″ slip PVC connection and adapters for 1-1/2″ piping, allowing straightforward integration into most in-ground or new pool builds. The unit’s inline configuration reduces the risk of air pockets and ensures a consistent feed rate when paired with compatible controllers. This feeder is a solid option for pools that rely on in-line chlorination and prefer a fit-and-forget approach.
Compatibility and maintenance are straightforward: the Rainbow 320 feeder is purpose-built for chlorine or bromine dosing in large pools and spas, providing dependable dosing when installed correctly in the return line. Routine checks of the feed rate and occasional cleaning of the reagent tray will help maintain consistent sanitizer levels over the swim season.
XtremepowerUS Inline Chlorinator
The XtremepowerUS inline chlorinator is built for straightforward inline installation in the pool return line, after the heater and filter. It supports 3-inch slow-dissolve chlorine tablets, with a dial-controlled valve to regulate the feed rate. This design provides a simple, reliable way to maintain steady sanitizer levels without frequent tablet additions.
In addition to inline operation, the unit is marketed with an offline compatibility note, offering flexibility when inline space is constrained. The 9-pound tank capacity supports extended dosing intervals between service checks, and the heavy-duty resin body is designed for durability in outdoor pool environments. Installation is aided by a user-friendly cap and accessible dosing area for tablet replenishment.
For inground pools with space constraints or retrofits, this model offers a practical balance of ease of use and dosing control. You can adjust how quickly chlorine or bromine is released, adapt to seasonal pool use, and maintain water clarity with minimal daily attention.
CL200 In-Line Chlorinator
The CL200 inline chlorinator from Edovaf is designed as a compatible inline solution that can be fitted directly in a pool’s return line. With 2-inch pipe connections, it serves pools up to the 40,000-gallon range, depending on turnover and usage. An adjustable dial delivers precise feed control, while a finger-release latch provides safety when refilling or servicing the unit.
This model emphasizes straightforward installation and reliable inline operation. It is a practical replacement option for users already familiar with Hayward CL200 feeders, offering a familiar interface and proven performance in many inground pool setups. Routine maintenance includes checking the feed rate, inspecting seals, and ensuring the valve remains free of debris.
For inground pools that require a compact, inline solution with adjustable dosing, the CL200 offers a balanced blend of simplicity and reliability. It’s well-suited to standard chlorine tablet formulations and helps keep sanitizer levels steady without complex automation.
Upgraded R171016 Rainbow 300 Feeder
The Upgraded R171016 feeder is designed as an offline chlorine feeder compatible with Pentair Rainbow 300 systems. It features an integrated base made from UV-resistant polypropylene with fiberglass reinforcement, which helps resist deformation and extends service life. A 360° rotating clamp simplifies mounting and alignment in variable installation environments, accommodating 1.5″ to 2″ pipes for flexible placement.
Design improvements emphasize reliability: a ceramic sealing ring paired with a stainless steel spring in the control valve enables precise flow adjustment while resisting corrosion. The upgraded base and gasket provide better sealing, reducing leaks and maintenance needs. When paired with a Rainbow 300 setup, this feeder offers robust performance for mid-to-large pool applications.
In addition to the durable base and improved valve, the unit’s offline configuration makes it a practical option for retrofits or installations where inline space is limited. With a stated capacity around 72,000 gallons, it targets larger residential and light commercial pools, delivering steady chlorine dosing with reduced manual intervention.
Upgraded 320 Pool Chlorinator Vikua
The Vikua 320 chlorinator is designed for Rainbow 320 compatibility with a focus on high-capacity, inline operation. Its closed, circular system supports multiple tablet sizes, with a recommended capacity for both bottom and top feeding in a wide range of pool sizes. The unit accommodates 11 large or 98 small tablets, adjusting dosing according to pool demands.
Key design elements include a vent plug to regulate internal pressure and an intake/outlet control valve for flexible dosing. A bottom drain simplifies removal of residual liquid, and a 1/4-inch feed hose facilitates water delivery through the top vent connection. This model is well-suited for inground pools needing robust inline dosing with adjustable, variable-rate chlorine or bromine release.
Overall, the Vikua 320 feeder balances capacity, control, and ease of use, making it a strong option for seasonal pools or high-usage inground installations that require consistent sanitizer performance without continuous manual dosing.
Buying Guide
Choosing the right automatic chlorinator involves evaluating how your pool is plumbed, its size, and how you prefer to manage sanitization. Inline feeders slip into the return line and are common in new build or retrofit installs; offline models connect through separate piping runs and can simplify access for maintenance. For inground pools, both setups work, but space, pipe size, and water flow considerations matter a lot.
Key purchase considerations include:
- Pool size and turnover: Larger pools often benefit from higher-capacity feeders (tens of thousands of gallons) and robust control valves to maintain stable sanitizer levels.
- Connection sizing: Most inline models use 2″ piping, while some units accommodate 1.5″ lines. Verify your plumbing before buying.
- Feeding method and sizing: 3″ slow-dissolve tablets vs. smaller forms affects dosing rate and refilling frequency. Ensure the unit supports your preferred sanitizer type (chlorine or bromine).
- Control and adjustment: A dial or knob that smoothly regulates the feed rate helps match dosing to pool usage and weather changes.
- Material and durability: UV-resistant plastics and corrosion-resistant components extend life in outdoor environments.
- Maintenance needs: Look for features like finger-release latches, vents, and drains that simplify refilling and cleaning.
- Installation flexibility: Some offline feeders offer flexible mounting with 360° clamping; inline units should align cleanly with the return line and heater.
- Warranty and support: A solid warranty and accessible support can reduce long-term maintenance concerns.
At a glance, inline feeders tend to deliver straightforward, space-efficient installation for most inground pools, while offline feeders provide flexibility when inline space is tight or retrofitting existing plumbing. Capacity and control precision vary by model, so align the choice with your pool size and turnover rate. For Rainbow 320 or 300 systems, selecting a feeder designed for that line helps ensure compatibility and predictable dosing across seasons.