Originally Posted by reefrunner69
Curious though logan, why don't you just make an overflow? The one on my fuge works great.......
and I'm worried that I wouldn't build it large enough to handle the flow. I would really feel better with two overflows I guess. I have a outer box with two 1" drains and I think I can cram two 1 1/4" U tubes in it. I'll have to build the inner box though. You think that will handle a Little Giant 1200gph pump?
Perhaps I misunderstand the design of the CPR overflow. All my overflows have a hole drilled in the top of the U tube with a piece of acrylic air line glued in. A piece of vinyl tubing is run from that to the venturi on a PH. Since the end of the tube is underwater, you don't lose the siphon when the pump shuts off. Also, a Maxi Jet 1200 will restart the siphon if it's lost...I think a 900 probably would. This keeps the air bubble that always seems to form in the U tube under control also. Am I missing something? It has worked great so far, but I may have set myself up for a flood and not even realized it.