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Civil Engineer
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The main reason that pumps are placed inside the house is convenience of access, especially in the winter, and to prevent freezing. You do not indicate where you are from, so I don't know if freezing is an issue. If not, it is possible to put the pump pit outside.

Regardless of where you put the pump and pit, it is necessary to pump the water away from the house, and hopefully to a point where it will not return to the foundation. Typically this means pumping to a stream, to the storm drain system, or possibly to a point on your property far from the house. If this is not done, you get what is known as short circuiting, meaning you are pumping the water out, the water returns via groundwater flow to the pump, and you pump it again. Possibly this is your situation.
 
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