The Pentair Rainbow #300 feeder treats pools from 6,500 gallons up to 48,000 gallons in size. This tablet feeder retrofits into existing pools or spas and is installed off-line near the pool equipment to provide a steady amount of chemicals to sanitize the pool.

Rainbow Automatic Chemical Feeders by Pentair are high capacity feeders and provide one of the easiest ways to sanitize large residential and commercial swimming pools using either chlorine or bromine tablets or sticks. The Rainbow #300 Off-Line Automatic Chlorinator is a swimming pool chemical feeder designed to hold 11 large chlorine tabs or 98 small 1 inch chlorine or bromine tablets.