NatualSof NS-RVF is integrated within a 2-1/2 x 10 inch canister filter that can be used with any standard replaceable filter cartridge. This simple salt-free water conditioner is specifically designed for use in your RV or coach. No power, no chemicals and no maintenance. Simply use at any point of your water supply or install using the easily adaptable ends and mounting bracket for service in a stand or mounted inside the RV. NaturalSof NS-RVF will prevent and even reverse build-up of damaging calcium scale typically affecting the water heater, dishwasher, clothes washer, on shower heads, faucets and glass.