10 Best Inline Chlorinators 2025 in the United States

The CCH Endurance Commercial Pool Chemical Feeder 73100 is a 3-in-1 commercial inline chlorinator designed to work well with ORP sensors for enhanced pool chemical control. It is lightweight and fairly compact considering its commercial use, making installation and maintenance straightforward. This product is ideal for pool owners or operators seeking a reliable chemical feeder that supports tablet chlorine delivery.

Its ease of servicing is a strong advantage, especially for those without extensive technical knowledge. The feeder is a good fit for smaller commercial pools or serious residential users who want an easy-to-use, sensor-compatible chlorinator. Those with larger pools or in need of precise flow adjustments might consider seeking additional information before purchasing.

The Pentair R171240 Rainbow HC-3340 is a commercial-grade inline chlorinator designed to automatically feed chlorine or bromine into your pool system. It features a completely enclosed system that prevents chlorine gases from escaping, which enhances safety and maintains chemical effectiveness. The clear amber filter housing helps you easily monitor the chlorine tablet levels, simplifying maintenance.

The product dimensions and weight suggest it is built solidly; however, the lack of included unions means you might need to purchase extra fittings for installation, potentially adding to setup effort and cost. The unit is NSF listed, indicating it meets safety and quality standards. Its sturdy materials imply durability, though information on fine-tuning the chlorine feed is not specified.

This chlorinator is best suited for larger or commercial pool setups where reliable, enclosed chemical feeding is critical. Users should be prepared for some extra installation steps and verify compatibility with their pool system’s flow.

The Pentair R171096 Rainbow 320 is an automatic in-line chlorinator designed for both pools and spas. It stands out for its capability to maintain consistent water sanitation, which ensures a clean and healthy swimming environment. This model is compatible with both large and small bromine or trichlor tablets, making it versatile for different pool or spa sizes. It can hold up to 11 large or 98 small tablets, which offers convenience for less frequent refilling.

The installation is relatively straightforward as it integrates permanently into the return line of new or existing systems and comes with 2” slip PVC fittings and adapters for 1-1/2” lines. However, it's worth noting that unions are not included, which might be an additional purchase for some users. Durability and material quality seem reliable given its good reviews and the fact it is made in the USA.

One possible drawback could be the lack of included unions, which might complicate installation for some users. Additionally, while the feeder is designed for permanent installation, this might limit flexibility for those who prefer temporary setups. This chlorinator is ideal for users looking for a dependable and efficient solution that offers good adjustability and ease of maintenance.