Any body used one of these systems. They are advertising the a DIW-10 model of $300. They say that it will give you approximately 100 gallons of water for a $60 set of filters. I am not sure how many car washes that you can get out of 100 gallons of water. If it is only one, that is a lot of money per car wash. You could hire some one to wash the car for that much money.