 click It's meant for RV motorhomes to refill their water tanks with filtered watered. Basically you attach it inline to the water hose. Then wash your car with the filtered water.I just did the ultimate test here under the SoCal sun with some of the crappiest water on earth. That's normally a no-no in my book. I usually wait until just before the sun goes down to wash the car. Without the filter, you'd have to wash the car, rinse and dry it right away or else the water dries up quickly and leaves water spots all over. With the filter, the water didn't dry up instantly like it normally does. Drying up with an Absorber was much easier than before and left little to no waterspots. I wasn't willing to wait around and see if the water would just evaporate like that AutoDry is supposed to do. You can get them at Wal-Mart with all the RV accessories, near the sporting goods stuff. And yes, it FIGHTS BACTERIA w00t lol

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