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Old 08-01-2012, 01:15 PM   #1
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sump pump outside will it freeze?


I have 2 sump pits for my house. 1 is in the basement and the 2nd is outside. the one in the basement is fine. but the pump out side is toast. I am going to replace it with a zoeller 57m.
now the pit is about 10ft down to the bottom. I am worried that if I put a check valve on that the pipe will freeze up in the winter.

other thing is I am not sure if the out side pit is meant to be a over flow, back up, or what? It is only about 8ft away from the one inside. It looks like it may be a bit deeper to the bottom then the one inside.

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Old 08-01-2012, 02:48 PM   #2
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sump pump outside will it freeze?


If the pit is deep enough or wide enough to hold a large amount of water before the pump has to start then you do not need a check valve.This lets the water drain back down to prevent freezing.

For a long time I have suggested having 3 cubic feet (a little over 20 gallons) of space below the turn on level and not filled with rocks.

With the entirety of the pump below about 4 feet and the lid at least semi-sealed to prevent air infiltration and exchange, the pump and pit should not freeze up.

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