A small grinder pump (also called a sewage grinder pump) is designed to macerate solid waste and pump effluent from a septic tank or sewage system to a higher elevation or a distant drain field. Here's what you need to know:
Function: Grinds solids (toilet paper, organic waste) into a fine slurry before pumping.
Applications: Used in septic systems, basement bathrooms, or where gravity drainage isn't possible.
Installation: Typically installed in a separate septic pump tank or directly in a sewage basin.
Drum Grinder Pumps: Some systems use a rotating drum mechanism to help break down solids before grinding (less common).
Standard Grinder Pumps: More common—uses sharp rotating blades to shred waste before pumping.
Horsepower (HP): ½ HP to 1 HP for residential use.
Discharge Size: 1¼" or 2" for pressurized septic systems.
Automatic Float Switch: Turns the pump on/off based on liquid level.
Check Valve: Prevents backflow into the tank.
Corrosion Resistance: Stainless steel or cast iron construction for durability.
Liberty Pumps (LG Series): Reliable, affordable residential grinders.
Zoeller (Mighty Matic): Durable, high-performance septic grinder pumps.
E/One (Extreme Grinder): Good for low-pressure sewer systems.
Goulds (Grinder Pumps): Heavy-duty options for tougher applications.
Ensure proper venting to prevent airlock.
Install an alarm to alert if the pump fails.
Follow local codes for septic and pump discharge requirements.
Inspect annually for wear or clogs.
Avoid flushing non-biodegradable items (wipes, feminine products).
Check the float switch for proper operation.