Hayward CL2002S In-line Automatic Chemical Feeder In-Line Chlorinator for above-ground and in-ground pools and spas Chemical Feeder that will automatically release chemicals so you don't have to; Unique finger-release catch provides extra security Uses large or small, slow dissolving, Trichlor or Bromine tablets or sticks; Works on newly constructed or already existing pools and spas Dial control valve allows for simple feed rate adjustment; Features 2" inlet and outlet ports for application with 50 gpm to 90 gpm flow rates Simple installation when replacing existing chlorinator or brominator; Easy-Lok threaded cover for safe and convenient access to add tablets or sticks