New Water 01010400 Inground Cycler 400 In-Line Feeder Chlorine Based System New Water 01010400 In Line Chemical Feeder for Inground Swimming Pools/Spas (Up to 40,000 gallons) 2" FPT Inlet/Output The New Water Cycler acts as the "water treatment center," controlling the flow of water through the system. The pre-filled Cycler Pac fits into the Cycler with no measuring, no lifting heavy buckets and no over-powering chlorine fumes. Easy to install