My parents have something similar that they got installed with a fancy french drainage system in their basement. Not sure on the GPH, but they are quite capable. Their system has the main pump on 110 AC and 12 DC (boat battery backup with a tender and all) in the lowest part of the basement, and the backup is in the second lowest part, just on 110.
Haven't had issues since then.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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