Automatic pool chlorinators keep water chemistry stable by continuously dosing chlorine or bromine. This guide highlights five top in-line chlorinators that work with a variety of pools and spas, detailing capacity, compatibility, and key features to help you choose the right feeder for your system.
Summary of chosen products
| Product | Brand | Capacity | Compatibility | Notes |
|---|---|---|---|---|
| Pentair Rainbow 320 In-Line Feeder | Pentair | 11 large or 98 small tablets | Rainbow 320 inline systems | Classic in-line model for pools and spas |
| Hydrotools 8750 In-Line Chlorine Feeder | Swimline | 9.0 lbs capacity | Universal compatibility | Automatic distribution with Easy Seal |
| Upgraded R171016 Pool Chlorinator Model 300 | Tofcbye | 11 large or 98 small tablets | Offline pool feeds | Sturdy ABS construction; sealed design |
| Swimline Hydrotools 87501 | Swimline | 4.2 lbs capacity | Above ground & inground | Economy option with universal fit |
| MAYGO CL200 Inline Chlorinator | MAYGO | 9 lbs capacity | Above ground & indoor pools | Omnidirectional control knob |
Pentair Rainbow 320 Automatic In-Line Feeder
The Pentair Rainbow 320 in-line chlorinator is designed for pool and spa systems requiring a steady chlorine or bromine supply. It accommodates 11 large or 98 small tablets and uses a closed circulation system for efficient filtration. The unit supports both in-line installation and offline operation depending on system needs. Typical use cases include residential pools with standard return lines and spa setups that benefit from continuous sanitization. The model emphasizes compatibility with Rainbow 320 configurations and is a reliable option for maintaining water clarity.
Hydrotools 8750 In-Line Chlorine Feeder
The Hydrotools 8750 offers automatic chlorine feeding with universal compatibility. Key features include a 360-degree adjustable output dial to customize dosing, a secure Snap-Lock lid for safe access, and a simple installation that integrates with most pool filtration systems. This feeder is designed to minimize maintenance while providing consistent sanitizer levels. It’s suitable for both above-ground and in-ground pools, making it a flexible choice for multi-use properties.
Upgraded R171016 Pool Chlorinator Model 300
This model 300 offline chlorinator uses a closed-loop system capable of holding 11 large or 98 small tablets. It emphasizes a sealed design with thickened gaskets to reduce leaks, and a durable ABS housing for extended service life. The bottom drain simplifies removing residual liquid, helping to prevent buildup and clogging around the valve. It is well-suited for installations where a robust, maintenance-conscious feeder is preferred.
Swimline Hydrotools 87501 Economy In-Line Feeder
The 87501 offers an economical solution with automatic cleaning and a double-reinforced lid to ensure a tight seal. A 360-degree adjustment dial allows easy output customization, and its universal design supports straightforward replacement with existing pool equipment. It fits well for budget-minded installations that still require reliable chlorine or bromine dosing.
MAYGO Inline Pool Chlorinator CL200
The MAYGO CL200 serves as an inline pool chlorinator replacement option that supports up to 41,000 gallons with a 9-pound capacity. It features a 360-degree omnidirectional control knob at the bottom to adjust inlet and outlet flow, enabling precise dosing. It is compatible with both above-ground and indoor pool setups, and notes indicate a need for careful thread compatibility with certain plumbing configurations.
Buying Guide
Key considerations when choosing an automatic pool chlorinator:
- Pool size and volume: Larger pools require feeders with higher tablet capacity to maintain consistent chlorine levels.
- Inline vs offline: Inline feeders connect directly to return lines; offline feeders sit separately and manage dosing with a closed loop. Choose based on your plumbing and maintenance preferences.
- Tablet compatibility: Most feed systems accept standard chlorine or bromine tablets. Confirm tablet size (large vs small) and the number of tablets supported.
- Sealing and durability: Look for sealed designs with corrosion-resistant housings andgaskets to prevent leaks, especially in high-chlorine environments.
- Adjustability: A wide-range output adjustment helps tailor dosing to seasonal changes and usage patterns. A 360-degree dial is a common and practical feature.
- Installation compatibility: Ensure the feeder is compatible with your existing pump and filter setup, including pipe sizes and connection threads.
- Maintenance and drainage: Features like bottom drains or easy-access lids reduce maintenance time and keep the system clear of debris.
- Reliability and support: Reputable brands with proven performance and replacement parts can reduce long-term maintenance costs.
All five products above offer automatic dosing for pools and spas, with varying capacities, compatibilities, and features. When comparing options, align your choice with pool size, preferred installation method, and how much maintenance you’re willing to perform. Consider the balance of cost, durability, and ease of use to identify the feeder that best supports your water quality goals.