Convenient and easy to use, model RV-700 is a disposable exterior filter for drinking and cooking water. It also filters dirt and sediment to keep your storage tank clean and clear. This filter contains KDF. Bacteriostatic indicates that the system limits the passage or growth of bacteria that may already exist in the incoming water. It does not mean that the water leaving the system is safer than that of the water entering the system. For use with 3/4-inch flexible hose couplings in RV or Marine applications. It provides high flow rate for quick tank fill. Model RV-700 includes filter cartridge only (no hose) and can be used as the replacement cartridge for the RV-800. Cartridge life of 2, 000 gallons/1 season. KDF as tested by KDF Fluid Treatment, Inc.