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hm

@videotron.ca
reply to HarryH3

Re: Sump Pump - Discharge riser freezing

said by HarryH3:

He can't remove the check valves. He has TWO pumps, a main pump and a backup pump. With no check valves in place then most of the water will just backfeed through the non-running pump right back into the pit.

ah that's right. So we can scratch that one.