This guide helps buyers choose reliable in-line chlorine feeders for in-ground or above-ground pools. The featured products suit different needs—from high-capacity feeders that minimize refills to compact, DIY-friendly units. The best picks balance ease of installation, durability, and consistent chlorine delivery for various pool sizes and usage levels. The table below compares key options to help you decide quickly.
| Product | Best For | Capacity | Installation | |
|---|---|---|---|---|
| Hayward CL200EF | In-ground pools needing steady dosing | Up to 9 lb | Offline feeder | Corrosion-resistant housing |
| Pentair Rainbow 320 | Pool or spa with permanent line setup | Standard 2″ PVC fittings | In-line, permanent | No special venting required |
| U.S. Pool Supply 9 lb Feeder | Above-ground pools needing simple install | 9 lb | In-line with lid wrench | Compatible with Hayward CL200 |
| CircuPool CORE35 Salt Generator | Saltwater systems | 0.04–0.07 lb/day output (salt generation) | Compact, no wiring | 8-year warranty |
| HYDROTOOLS SWIMLINE 8750 | Small to medium pools; fun features | Holds 5 tablets | Solar-powered, adjustable | LED light-up feature |
Hayward CL200EF In-Line Chlorine Feeder
The Hayward CL200EF provides automatic, offline chlorine distribution for in-ground pools. It supports up to 9 pounds of chlorine tablets, enabling longer intervals between refills while maintaining balanced water chemistry. The housing is designed to resist corrosion, delivering reliable long-term performance in common pool environments. Best for homeowners with in-ground systems seeking a hands-off approach to chlorine dosing, with durability as a priority. A potential limitation is that it operates offline and relies on manual refill scheduling rather than real-time dose adjustments.
Pentair Rainbow 320 In-Line Feeder
The Rainbow 320 is designed for permanent installation in the return line of pools or spas. It comes standard with 2″ slip PVC fittings and adapters for 1-1/2″ piping. This makes it a solid choice for custom builds or retrofits where a fixed chlorine feed is desired. Best for installations where a streamlined, in-line setup is preferred and where the plumbing can accommodate standard fittings. A caution: installation must align with return-line routing and may require professional plumbing adjustments.
U.S. Pool Supply 9 lb In-Line Feeder
This professional-grade in-line feeder is compatible with Hayward CL200, with a 9-pound chemical capacity. It includes installation accessories and a lid wrench for a leak-proof seal. Best for above-ground pools or retrofit projects where a robust, easy-to-maintain feeder is needed. It uses large or small slow-dissolving chlorine sources. A limitation is that it requires proper sealing to prevent leaks, and its performance depends on correct internal setting adjustments.
CircuPool CORE35 Salt Chlorine Generator System
The CORE35 offers a compact salt chlorination solution for pools up to 35,000 gallons. It provides automatic chlorine generation daily, reducing the need to manually add chlorine. Its plug-and-play design aims for simple DIY installation with no heavy wiring. Best for owners seeking long-term saltwater maintenance with low ongoing chemical handling. Limitations include the need for a saltwater-friendly setup and ongoing salt management for optimal results.
HYDROTOOLS SWIMLINE 8750 In-Line Feeder
The 8750 from Swimline is a versatile in-line feeder that can hold up to five standard 3-inch chlorine tablets. It’s designed for universal compatibility with both above-ground and in-ground pools, including bromine systems. Best for smaller to mid-size pools or as a supplemental feeder. A note: its capacity is lower than some 9-pound models, so refills may be more frequent for larger water volumes.
Buying Guide: Key Purchase Considerations
- Pool type and size: Choose a feeder with adequate chemical capacity for your pool volume and refilling interval.
- Installation type: Decide between permanent in-line installations and offline feeders, depending on plumbing layout and preferred maintenance routine.
- Compatibility: Check fittings (2″ vs 1-1/2″), compatibility with chlorine tablets or sticks, and whether a salt-chlorine generator is needed.
- Durability: Look for corrosion-resistant housings and weather-resistant designs suitable for outdoor pool equipment.
- Ease of maintenance: Consider models with straightforward lids, easy-to-clean components, and clear adjustment controls.
- Warranty and support: Favor brands offering reasonable coverage and accessible customer support for diagnostics and parts.
Frequently Asked Questions
- What is an in-line pool chlorinator?
An in-line chlorinator is installed in the pool’s circulation line to automatically dose chlorine into the water as it passes through the feeder.
- Do I need a professional to install an in-line feeder?
Some units are DIY-friendly with basic plumbing, while others may require plumbing adjustments. Assess your piping layout and local codes before installation.
- How often should I refill a 9 lb chlorine feeder?
Refill frequency depends on pool size, usage, and chlorine demand. Larger capacity feeders reduce refill frequency, but you should monitor chlorine levels regularly.
- Are salt generators compatible with in-line feeders?
Salt systems generate chlorine automatically, but some feeders are designed to work specifically with non-salt chemistry. Check compatibility before pairing.
- What maintenance is required for a chlorine feeder?
Regularly inspect seals, clean any scale buildup, verify correct flow settings, and replace worn gaskets or seals as needed.
- Which feeder is best for an above-ground pool?
Above-ground compatible models with 9 lb capacity and simple installation, such as the U.S. Pool Supply feeder, offer a practical balance of ease and reliability.