Oh those dreaded water spots. Wash your car, rinse it and if the water dries, "OH SHEET"! Now you have to polish out all the spots. No more. If you live in an area where your water is hard and full of minerals here is an easy to use solution. The 24" tall, 7 1/4" diameter tank comes filled with 13 lbs of our exclusive ion-exchange resins that remove minerals from the water through a process that binds them to the resin. Because the majority of the impurities are dissolved, deionization produces highly purified water so no more spots! The two valves control the water flow through the filter. This allows you to bypass the filter when it is not needed to prolong the life of the resin. The tank is on a rolling caddy so you can easily wheel it to the water source, hook it up, and you're ready to rinse. Add our Brass Quick Disconnect Set for faster, easy use. The life of the resin depends upon the amount of total dissolved solids (TDS) in your water. Want to know your TDS level? Check out my easy to use TDS meter. The resin is safe, disposable and replacement resin is easy to install.