Lowers pH level in swimming pool water.
When pH Value Rises Above 7.8:
While the pump is in operation, distribute 4 oz. (1/4 lb.) for each 10,000 gallons of water into the deep end of the pool (but not near metal fittings or the skimmer).
Allow 6 to 8 hours for distribution throughout the pool, and then recheck the pH.
Chlorine, bromine, ozone, biguanide sanitizers, and salt water pools