Now we're adding the quiet check valve (QCV1 50 from Liberty) to minimize that annoying thumping sound. What I love about this valve is that it’s made from clear plastic, so you can easily see what kind of water the sump pump is pumping out—whether it's sandy, murky, or clean water. Next, we’re installing the float switch for the backup pump. The reason I go with 11 inches for the combined pieces is to ensure the pump sits just above the basin with a few inches to spare. Plus, the bottom of the
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