PVC Backflow preventor

[TRIX]

Originally Posted by danny zubot

If you "T" the intake pipe going into the tank wall, and run a pipe straight up the outside back of the tank so that it is above the water line, it should break the siphon when the pump is off. You need to make sure there is no back pressure from your spray bar or this pipe will be overwhelmed, and flood.

The return goes into the tank dead center on the bottom for 4 sides of viewing. Would this still work

[MikeP]

My 190g has the same thing. Originally I thought of doing what you are thinking of. For fear of flooding I had another return drilled (through the back on the opposite side of the overflow). That bulkhead is still below the water line but in addition to a check valve I designed my sump to be big enough to handle the additional water if I did lose power. What I plan to do to do with the bulkhead in the bottom of the tank is run some PVC strait up and just above the overflow so that if my overflow ever got clogged it would act as a back up overflow.

HTH