10 Best Swimming Pool Chlorine Dispensers 2026 in the United States

The Pentair R171070 Rainbow 300-29X is a heavy-duty automatic dispenser designed for commercial or large pools and spas. It stands out with its high capacity, capable of holding up to 29 large or 237 small Trichlor tablets, and can dispense up to 8.5 pounds of sanitizer daily. This makes it well-suited for very large pools, treating between 80,000 and 322,000 gallons of water. The built-in 1/2-inch control valve and tubing help optimize sanitizer flow and reduce erosion, ensuring consistent chlorine or bromine delivery. Measuring about 40 inches tall, it’s relatively compact considering the volume it handles.

The unit is praised for maintaining clean, sanitized water effectively, but its larger size and capacity mean it may be more than necessary for smaller, residential pools. Adjustability is built-in via the control valve, allowing users to regulate sanitizer flow, but it requires some familiarity to optimize settings. This dispenser is a solid choice for commercial pool operators or owners of very large pools who need high-volume, automatic chlorine or bromine dosing with minimal manual intervention.

The Pentair Rainbow HC-3315 is an automatic commercial high-capacity chemical feeder designed for swimming pools. It features a clear amber filter that allows you to easily monitor tablet levels, which is a convenient feature for ensuring consistent chlorine levels. The completely enclosed system prevents the escape of gases, enhancing safety and eliminating the need for special venting. This makes it suitable for commercial use where safety and ease of maintenance are critical.

However, it does not include unions, which might require additional purchases or modifications for some installations. The unit is NSF listed, assuring its quality and safety compliance. With a weight of 5 pounds and dimensions of 23.5 x 7.75 x 7.75 inches, it's fairly compact for its capacity. The product ranks #388 in Swimming Pool Chlorine, reflecting moderate popularity. It is well-suited for commercial pool operators looking for a reliable, high-capacity solution with easy monitoring and maintenance.

The Pentair R171096 Rainbow 320 Automatic in-Line Chlorine/Bromine Feeder is designed for both pools and spas. Its main advantage is the lack of special venting requirements, making installation straightforward. The feeder is permanently installed into the return line of your pool or spa, which can be a convenient feature for those looking for a long-term solution.

It can hold a substantial amount of chlorine or bromine tablets, with a capacity of up to 11 large or 98 small tablets, providing consistent and continuous water sanitation. This ensures your pool stays clean and healthy with minimal effort on your part. The feeder is made from durable PVC, which is a common and reliable material for pool equipment, ensuring longevity and resistance to pool chemicals.

However, the unions are not included, which might require an additional purchase and could complicate the installation process for some users. Additionally, its size and weight (14 x 26 x 46 inches, 4.5 pounds) should be considered to ensure it fits well within your pool setup. This product is ideal for pool owners looking for a reliable, high-capacity chlorine dispenser that provides ongoing water sanitation with minimal maintenance.