The Pentair Rainbow R171218 Automatic In line Chlorine Feeder see through Amber canister uses large or small Chlorine or Bromine slow-dissolving tablets, The Rainbow 320C Series installs in return line on pressure side of pump downstream of all equipment. Comes standard with 2 in. X 1-1/2 in. slip PVC bushing for adapting to 1-1/2" or 2" plumbing. The in-line Model 320C features an external fine control valve that lets you adjust the feed rate to meet specific pool or spa requirements. Pentair #320C Parts List Holds 11 large slow dissolving tablets Clear Yellow Body allows you to see the tablets Dail control valve lets you control and adjust the rate of feed No special venting required Completly enclosed system No escaping gases NSF Listed.
Holds 11 large slow dissolving tablets