Product Overview

The Pentair Rainbow 320 In-Line Automatic Chlorinator (R171096) is an in-line tablet feeder that plumbs directly into the pool return line after the filter and heater. It holds slow-dissolving trichlor or bromine tablets and meters sanitizer into the water as it circulates, reducing the need for manual chlorine additions.

Automatic Chlorine and Bromine Feeders: The Easy Way to Sanitize Large Pools

These heavy-duty, high-capacity feeders provide automatic sanitization for residential or commercial pools up to 658,500 gallons. All sizes operate effectively and efficiently with slow-dissolving trichlor or bromine tablets.

Ideal For

Residential pools using trichlor or bromine tablets

New equipment pads with room for an in-line feeder

Replacing an existing Rainbow 320 feeder

Key Features

300 and 320 Series filters available in clear amber for easy tablet level monitoring

Completely enclosed system—no special venting required

50 PSI maximum operating pressure

No escaping gases

Genuine Pentair Rainbow feeder: part number R171096.

In-line installation on the return plumbing.

Holds 11 large or 98 small tablets.

Enclosed design: no special venting required.

Specifications

Warranty & Compatibility

Compatibility Notes

Use only slow-dissolving trichlor or bromine tablets. Never mix different chemicals in the feeder. Confirm your return-line plumbing size and available space on the equipment pad before ordering.

Installation Notes

Install in-line on the return side after the filter and after any heater, so concentrated sanitizer does not pass through equipment. Use a check valve between a heater and the feeder where required. Follow Pentair's installation instructions and wear protective gloves and eyewear when handling tablets.

Customer-Facing Q&A

Q: What is the part number and UPC?
A: Pentair R171096, UPC 788379004385.

Q: How many tablets does it hold?
A: 11 large or 98 small trichlor or bromine tablets.

Q: Can I use bromine tablets?
A: Yes. It works with slow-dissolving trichlor or bromine tablets, but never mix the two.

Q: Where is it installed?
A: In-line on the return plumbing, after the filter and heater.