Concentrated Formula Cleans Spa Cartridge Filters ClearRay® Filter Cleaner is a concentrated cleaning solution containing grease and oil emulsifiers and wetting agents. It is designed specfically for removal of oils, grease, and soaps, restoring filter to original condition. Cleaning your filter will reduce pump electricity costs and will decrease the potential for bacterial growth. For use with chlorine, bromine, and ozone based sanitizers. Directions for Use: 1. Remove cartridge or elements from filter housing 2. Use full strenght on elements and brush clean =, or soal elements in a solutions of 1 part ClearRay® Filter Cleaner to 10 parts water (1 qt to 2.5 gallons). Soak for 3 hours or overnight. 3. Rinse with garden hose and replace elements or cartridge.