I use one here at home so I can clean out my tanks. yes they do use a lot of water and yes I don't like people who back flush their tanks 3 times while the rest of us sit inline waiting for them to finish. we have a gas station who lets us empty our tanks free of charge, one guy I know would fill his tanks up so many times and let the station owner foot the bill for the water. I think that is down right wrong to do this. one of these days the station owner is going to start charging us to use his dump station. it's butt heads like the one guy who ruin it for the rest of us