This Floating Chemical Dispenser is constructed of high impact polystyrene plastic, for durability and years of trouble-free service. The Tropical floating chemical dispenser is fully adjustable and will dispense tri-chlor chlorine tablets or bromine tablets up to 1 3/8" diameter. The adjustable gate control is enhanced by the vented full-flow design. The refill access cap allows the reloading of tablets without affecting the gate setting. Now in four colors: Blue, Tan, Gray and Green. For easy, trouble free chemical maintenance of your Spa or Hot Tub, use the Tropical Floating Chemical Dispenser.