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#11
08-04-2009, 04:41 AM
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The biggest reason I want the check valve is because I have a 30 gallon sump that has its compartments set up to use up 25 of the 30G, roughly, when running normally. So if ever the power went off the return lines and the overflow box would drain into the sump. I have estimated this to be around 20-25G and so that'd mean 15-20G on my floor if the power did go out.
The return is a 3/4" manifold that splits into four 1/2" returns. 
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