The Pentair R171096 Rainbow 320 In-Line Automatic Chlorinator is a permanently installed tablet feeder designed for automatic pool and spa sanitization. Engineered for installation in the return line downstream of the filter and heater, the Model 320 dispenses trichlor or bromine slow-dissolving tablets directly into the circulation system. Its fully enclosed design prevents escaping fumes, while the external fine-control valve allows precise adjustment of sanitizer output to match pool demand.

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Key Features

• In-line installation designed for permanent placement in the return line after filter and heater.
• Uses 1" or 3" slow-dissolving trichlor tablets; compatible with bromine tablets.
• External fine-control valve allows precise adjustment of sanitizer feed rate.
• Completely enclosed system prevents escaping fumes and reduces manual chemical handling.
• Top-loading design simplifies tablet replacement and routine maintenance.
• NSF listed for residential and public pools when used with approved trichlor tablets and flow-indicating devices.
• Maximum erosion rate up to 1.75 lbs per 24 hours depending on feed configuration.
• Chamber capacity holds up to 98 one-inch tablets or 11 three-inch tablets.

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Product Overview

The Pentair R171096 Rainbow 320 In-Line Automatic Chlorinator provides consistent, automated chlorination for residential and light commercial pool and spa systems. Installed vertically in the return line downstream of all major equipment, it introduces sanitizer directly into circulating water to maintain stable chlorine levels while minimizing manual handling of chemicals. The enclosed housing design enhances safety and eliminates the need for special venting.

The Model 320 features an adjustable external control valve that allows operators to fine-tune sanitizer output based on pool size, usage levels, water temperature, and seasonal conditions. With substantial tablet capacity and controlled erosion rates, it supports extended intervals between refills while delivering dependable sanitation. Designed for durable performance and straightforward integration into PVC return plumbing, the Rainbow 320 offers an efficient and reliable solution for maintaining proper water chemistry in pool and spa environments.