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Completely depends on the size and application. The volume of debris required to grind and the materials it's comprised of will wear the grinder teeth and impeller.

I would say it's safe to assume an average 1/2 HP residential sewage grinder pump running a single family home would run at least 5 to 10 years maintenance free. 20 years wouldn't be out of the possibility, but if you have a garbage disposal, frequently dispose of chemicals down the drain, or have a lot of usage I would say 20 years wouldn't be so likely, 10 would be more realistic.

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Q: How long do sewage grinder pumps last?
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