I run off my cooling water into three connected 55G rain barrels which are then used to water the yard. Used cleaning solutions degrease the driveway (classic British cars, they leak a bit). I am getting an RO system soon, and I will be piping the effluent from that into the same rain runoff system. As I brew more, though, I am going to max out those barrels before I use the water in the yard, especially in the winter when I brew more (and we get the occasional storm in Los Angeles). I never thought of putting some of the water into the clothes washer, especially the hot water that comes out of the plate chiller first. Brilliant!