GLB Pool and Spa Products 71244 2-Pound pH Up Pool Water Balancer Sanitizer lowers ph level in swimming pool water Aids in preventing staining&#44; scaling and clouding of pool water Works most efficiently when ph is kept in proper range Allow 6 to 8 hours for distribution throughout the pool and then recheck the ph Compatible with chlorine&#44; bromine&#44; ozone&#44; biguanide sanitizers and salt water pools When pH falls below 7.2: while the pump is in operation distribute pH up into the deep end of the pool For every 10, 000-gallon water, add 1-pound when pH is below 6.6; 3/4-pound when pH is between 6.6 and 7.0; 1/2-pound when pH is between 7.0 and 7.2 Keeping proper pH levels ensures maximum efficiency of pool sanitizers and aids in preventing staining, scaling and clouding of pool water Comparable with chlorine, bromine, ozone, biguanide sanitizers, and salt water pools Measures 9.4-inches in height by 3-inches in length by 3-inches in width; 2 pounds weight