Before adding this product, predissolve first by mixing with water in a clean plastic container. Pour solution into water at various sites around edge.

Ideally, pH should be tested daily. When test kit shows a reading above 7.8, add 15 grams for each 1,000 L of water using method of application shown above. Allow water to recirculate from 2 to 4 hours and retest pH. If necessary, repeat above until reading is between 7.2 and 7.8. When reading is below 7.2 use PH Miinus as per directions.