Below is a picture of my sump pit, no pump. When the water drains from the wash machine, the water flows back in through the main drain pipe at the bottom of the pit, filling the pit almost half full. The water will eventually recedes(about 20 minutes or so, so i dont think the drain line is completely blocked...but i have never seen this before...any ideas? Is the laundry drain tied into this ground water line somewhere further down ad it is blocked??
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Sump pit drain issue