I appluad anyone who can properly collect and recycle antifreeze. Or really any other fluid I guess. Unfortunately for me, and I guess for the ground, I'm not one of them. And I DO drink the water directly under me. I haven't had it tested in a while, but when I did, it was in pretty good shape, except for the chemicals that got into it from the farmers pesticide operations. When I do a cooling system, I usually drain what I can out of the rad, and that does end up in a 55 gallon drum that is slowly filling with antifreeze. Unfortunately, because none of my block drains come out, I have to "push" the old coolant out with water, and that becomes a multi dozen gallon operation. If I tried to catch all that waste, I wouldn't be able to handle the volume.