What is a Grinder Pump? - Definition from Trenchlesspedia
A grinder pump is a wastewater conveyance device. Wastewater and water from water-using appliances flows through the home's pipes into the grinder pump's holding tank. Once the wastewater inside the tank reaches a specific level, the pump will turn on, grind the waste into a fine slurry, and pump it to the central sewer system.