The Portable RV Water Softener was designed to soften the water supply in RVs and can easily be installed inline with your water supply or to fill your fresh water tank. It can also be used to soften water in boats, carpet cleaning machines, spas or Jacuzzi, patio misters, humidifiers, espresso or cappuccino machines, aquariums, etc. It’s easy to connect with water hose fittings (included) to any water hose (not included). It can be installed and used in any position (other softeners must stand upright) and the water can flow through it in either direction. Unlike other water softeners you cannot lose your resin and contaminate your RV’s water tank or water lines by hooking it up backwards (accidental back flow will not cause any problems). The resin can be regenerated easily with salt water.