Dynamic RCF25 Cartridge Filter III Top Load With Chlorine Dispenser 25 Square Feet intended usage_Residential Aboveground It has a single standard It has a single standard 9 volt battery that provides 40 plus hours of operation You can easily tighten the anchor prior to a race to prevent the platform from rocking The Pentair Dynamic III Model RCF25 Cartridge Filter is a top load with chlorine dispenser and is sized at 25 square feet with a max flow rate of 100 GPM and features an automatic dispenser and 2 inch socket plumbing size They include a 3 ounce cartridge filter that is manufactured with the finest quality filter media