Piece of advice for everyone out there thinking of making one of these--make sure your upspout pipe/tube is not too wide. I made one of these with all PVC, but the tube that shoots the water up is too thick and blocks the outflow of the water out of the carboy neck. It flows, but not enough to keep up with the water going in. Too much pressure builds up inside the carboy and... you get the idea...
Mine is now only used to clean cornys...
“While the rest of the species is descended from apes, redheads are descended from cats.” - Mark Twain