This Floating Chemical Dispenser is constructed of high impact polypropelene plastic, for durability and years of trouble-free service. The Tropical Floating Chemical Dispenser is fullly adjustable and will dispense tri-chlor chlorine tablets or bromine tablets up to 1-3/8" diameter. The adjustable rate control is enhanced by the vented full-flow design. The E-Z refill access cap allows the reloading of tablets or without affecting the rate setting. For easy, trouble-free chemical maintenance of your spa or hot tub, use the Tropical Floating Chemical Dispenser.