How loud is the grinder pump?

With an outdoor unit buried in the ground, you will not hear it at all if you are 10 or 15 feet away. If you are standing on top of it, it sounds like your washing machine when it’s running — just a hum (69 dB at 6 feet).

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1. How loud is the grinder pump?
2. How long will the pump operate each day?
3. What is the average yearly electrical cost to operate a grinder pump servicing the typical single-family home?
4. What can I flush with a grinder pump?