Thread: Nevin's 14G + 5.5G sump
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  #25  
Old 06-05-2008, 04:10 AM
Sebae again Sebae again is offline
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The thing about check valves is that they require head pressure to make them close. So at 6 inches bellow water height you would have .217 psi pushing down and at 1foot .433 psi . Therefore, the lower the better.
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