Prevents scale build-up and algae by effectively changing out the cooler water; designed to eliminate approximately 90% of mineral build-up caused by evaporation. Heavy duty tee will not corrode and easily connects to existing pump hose. Rate of bleed varies with pump pressure and bleed tee orifice size. Kit includes 1/4" 25' copper poly tube, bleed tee, 2 pump hose clamps, instructions. For standard 1/2" ID pump hose