How Does a Grinder Pump Work?


Into the Grinder Pump

  • A grinder pump, usually installed outside of the home in the ground but sometimes indoors, is where your waste water goes. When you flush the toilet, wash your dishes in the kitchen sink, soap off in the bathtub or rinse off your toothbrush in the bathroom sink, the waste water runs into the drain and through the drainage pipes. The drainage pipes connect directly to your grinder pump unit, and it is through these pipes and into the grinder pump that your waste water goes.

Storing Waste Water

  • Once the water, and all the waste along with it, has reached the grinder pump, it sits in "storage." The pump gradually fills up with waste water. The amount of waste water than can be stored at any given time depends on the type of pump you have. Regardless, once that amount has reach a certain level--the grinder pump's pre-set storage capacity--the device automatically turns on.

Grinding and Pumping

  • Now that the grinder pump is on, it goes to work. The waste is ground into a flowing watery pulp. This is necessary, since the water is filled with waste, often lumpy or hard. Everything from feces to fruit skins to anything else that has passed through the drain is thoroughly ground so that it can pass without a problem through the main sewer lines.

    Once the water waste has been ground by the grinding pump, it is pumped out of the unit and into the pressure sewer pipe (this is your own sewer system, located on your own land). The pressure sewer line connects with the main (public) sewer line (typically along the street by your property), where your ground waste is carried away. The grinding pump them shuts off by itself, once again acting as a water waste storage unit.

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