Slow Dissolving 140 Grams Cube Clears Cloudy Pool Water Resulting Sparkling Crystal Clear Water and Aids in the removal of Phosphates Ensure Chlorine and PH levels are correct Place one cube into the skimmer basket In leafy areas, place cube below skimmer sock 24 Hours after adding Crystal Cube, Backwash filter twice Replenish with a fresh cube as requires to maintain your pool water in sparkling condition