Quote:
Originally Posted by mrhasan
Had a check valve but forgot to place it 
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Have you installed the check valve? If not, then are you planning to? Looking at your sump there doesn't look like a lot of room for back flow in the event of a power failure? Hard to see in the pic to determine for sure though. Did you design the sump with room for back flow in the event of a power failure or were you going to rely entirely on the check valve?