01-31-2007, 04:36 AM
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Originally Posted by caferacermike
You are correct about having enough room in the sump to let out that last 1/2" water from the main tank through the wier, or overflow for those not familiar with the term. Many of us choose not to use a backflow as they add restriction. I prefer to have my pump run wide open. To compensate for not having a backflow, or checkvalve, I drill a 3/32" hole at the water line of my suction tube and my return line. As soon as I lose power my return line hole is exposed to air thus immediately breaking the siphon of the unexposed return.
Think I understand now.
Normal flow from the pump to the tank.
Should the pump fail and water begin siphoning from the tank, through the pump and into the sump a small hole in the tubing located some minimal dimension below the water surface will break this siphon.
Normal flow from the tank to the sump.
I have an overflow weir which controls the water surface in the tank.
Your system must operate via an intake tube the intake orifice of which is located below the normal water surface in the tank and siphons water from the tank into the sump.
Should the pump fail and water begin siphoning from the tank into the sump a small hole in the tubing located some minimal dimension below the water surface will break this siphon.
Am I understanding this correctly now?