A multi–purpose granular formulation that cleans and unclogs filters from grease, oils and scale. Generates oxygen to assist with the cleaning function. Prepare solution using 11 oz. cleaner per 5-gallons of water. Specific instructions must be followed as per manufacturer for Neptune Benson DeFender regenerative filter. See below. For sand filters, backwash and drain filter, close drain valve, add sufficient solution to cover sand. Keep man-way or air-relief open during soaking to dissipate pressure build-up. Allow to soak for a minimum of 1 hour. Then put system back on line to perform backwash. Continue until water runs clear. Click on the "Product Details" tab above, to select container size. Instructions for Chem Clean and Filter Cleanse for the Neptune Benson DeFender Regenerative Filter: Follow owners manual for preparation of filter for cleaning. Once the system is off and ready to accept the cleaner, vacuum suggested amount of chemical into the tank. Fill tank with water to the top. Pre-coat for (2) minutes, open the pre-coat vent line to dissipate pressure build up. Turn the key switch to “maintenance mode” or “element cleaning mode”. The filter will automatically bump (6) times every 15 minutes. Once soak time has been reached for the specific cleaner, drain and fill tank twice to remove all cleaner residues. How Much Product Do I Need To Clean The DeFender? Chem Clean - Soak Time 1 Hour Model Number LBS. of Chem Clean SP-18-48-175 12.5 SP-24-42-327 20 SP-27-48-487 25 SP-22-48-732 37.5 SP-41-48-1038 55 SP-49-48-1548 80 SP-55-48-2076 110