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Holes in the bottom of the sump pit liner or barrel don't cause any problem unless dirt or stones come in and get sucked up by the pump.

In general, the best turn on level for the pump is slightly above the level of the bottom edges of the drain pipes entering the pit.
(For some houses a different level works better, although if the turn on level is too high then the system (the pipes) could get waterlooged and the far side of the basement could flood.)
 
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