ecoONE FILTER Cleanser penetrates and cleans deep inside the fibers of your filter without the use of harsh acids or bleach. Our proprietary wetting agents and alkaline cleansers thoroughly clean filter cartridges without leaving residue that can cause foaming or alter water chemistry. FILTER Cleanser’s ultra-concentrated formula is fast acting and economical with up to 15 uses per bottle. Regular use helps assure a clean, clear spa. An excellent companion product to PIPE Cleanser and the entire ecoONE® spa treatment line. Spa / Pool Cartridge Filter Cleaning Instructions: Combine one to two caps full of FILTER Cleanser with up to five gallons of water. Agitate filter to loosen contaminants and allow to soak for at least one hour. Rinse filter thoroughly with fresh water. Do not use high-pressure sprayers as they may damage filter elements. For best results, allow filter to dry before replacing. May be used in dishwasher. TURN HEAT DRY OFF.