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Thanks Thanks for the input everyone. In reply to Mebbid's post, What are HOB overflows? Diameter of PVC is 3/4 inches. Flow is 60 gallons/hr. The sump is part of a trickle down wet/dry filter for turtles because I found commercially available filters and pumps inadequate or prohibitively...

I built an overflow for a turtle tank and it works for a while but after about 2 hours the siphon fails. The inlet pipe is only about 5 or six inches from the bottom of the tank as there is a shallow water level. Here is a rough diagram of the overflow as an attachment in word. If I suck air out...