GLB® pH Up raises pH level in swimming pool water. Keeping proper pH levels will ensure pool sanitizers are working at maximum efficiency and prevent stain and scale formation. 
Features:
Allows raising of pH level as needed
Aids in preventing staining, scaling and clouding of pool water
Applications:
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 gallons of water add the following amounts:
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