Rainbow's 320 series of inline chlorinators are designed for permanent installation in the return line of pools and spas. Installing a Rainbow 320 series chlorinator is easy because you do not need to drill any holes.
Rainbow's 300 series of off line chlorinators are designed for existing pools and spas or where permanent installation into the return line is impractical. The Rainbow 300 series works on the pressure side of the pump and is to be used with slow dissolving Trichlor tabs and sticks or bromine tabs and sticks. Includes an easy to adjust control valve and check valve.
