Sump pump pit water level --- problem
In order to give the sump pump a reasonable running time and a reasonable rest between runs, either you need a straight sided pit with a large surface area or a pump with a large start height / stop height adjustment together with a pit that is reasonably deep.
If the check valve in the outlet pipe leaks a little, it is not performing its function and water in the outlet pipe is falling back down. This consumes some of the space in the pit so less new water is needed to start the pump again (undesirable).
To reduce basement humidity that may be caused by the sump pump, you would put a lid on the pit. Whether the pit is almost empty or almost full does not affect the humidity.
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Last edited by AllanJ; 02-27-2011 at 08:22 AM.