Pentair Rainbow Automatic Commercial High Capacity Chlorinator HC-3340, 40 lb, R171240

The Pentair Rainbow HC-3340, part number R171240, is an automatic high capacity tablet feeder holding 40 lb of slow dissolve chlorine or bromine tablets. It is rated for pools up to 658,500 gallons.

Why a high capacity feeder

On a large residential or commercial pool, a standard feeder becomes a daily chore. A 40 lb charge changes that: the feeder holds enough sanitizer to run for a long stretch, and the sanitizer goes in at a steady rate rather than in the peaks and troughs of hand dosing. Feed rate is set on an external dial, so the routine adjustment does not mean opening the lid.

Installation

The HC-3340 is designed for off-line plumbing using 1 inch PVC pipe, and the unions needed to make that connection come with it. Off-line means the feeder sits on a loop beside the return line rather than in it, so the feeder can be isolated and serviced without shutting the whole system down.

Serviceability

The details are what make a feeder livable. A vent valve bleeds pressure so the lid is not fighting you. The lock ring spins off and snap locks back on for a secure seal. The screen and check ball are easy to reach when they need cleaning. A drain valve empties the feeder before recharging or winterizing, which is a far safer way to open a tank that has been sitting full of tablets.