The Pentair Rainbow 320 In-line chemical feeder is designed for commercial or residential pools or spas up to 6,500-27,000 gallons. Automatically chlorinate or brominate your pool the easy and economical way. These feeders are easy to use and install on new or existing equipment. This high capacity, heavy-duty chemical feeder provides automatic sanitization for pools using chlorine or bromine tablets and sticks. The in-line permanent installation model installs on the pressure side of your existing pool pump on 1.5 or 2 inch PVC plumbing. Features a heavy duty control valve for accurate feed rate adjustments and easy access design that allows the feeder to be refilled quickly. Includes vent valve, lock ring, screen and check ball, flow-through circulation, external dial control, drain valve, and union set with a 5 pound feeder capacity. Holds 11 large or 98 small Bromine or slow dissolving Trichlor tablets.