Kokido KLOR-IN Automatic Swimming Pool Chlorine Feeder (1.5" Hose Dia.) Quick and easy installation to your existing filtration system, works automatically with your pump and filter system Compatible with filtration systems with a 1.5" hose diameter fitting Dial control valve lets you control and adjust the rate of chemical feed This Klor-In model K507CBX features a nine tablet capacity Uses 3-inch diameter tablets