Sewer Systems – Grinder Pumps

About the E/One Extreme Series Grinder Pump

All E/One grinder pump systems currently offered use the Extreme Series grinder pump. 

The grinder pump turns on and off automatically and runs for very short periods several times per day. Electrical consumption is low — a household that uses 250 gallons of water per day should use between 6 kwhr and 23 kwhr per month to run the pump. (Actual water and power usage will vary depending on the system pressure.)

Operational Information

Motor: 1 HP, 1725 rpm, high torque, capacitor start, thermally protected, 240 or 120 volt, 60 hertz, 1 phase

15 gpm at 0 psig
11 gpm at 40 psig
7.8 gpm at 80 psig

Electrical Information

For a standard 240V single-phase installation, a dedicated 30A breaker is required, with #10 wire, to the E/One panel. You need to bring L1, L2, N and Gnd.

If only 208V power is available, a buck boost transformer is required to boost 208V to 240V. The E/One pump requires a minimum of 216V to start and run reliably. 

Pump Diagram Drawings

Download the parts diagrams for Extreme Series grinder pumps and level sensor assemblies.

The E/One SPD Pump vs Centrifugal Pumps

E/One’s low speed, high torque, 133 mm wheel has an inlet velocity of  1.09 m./sec, which slowly introduces the debris into the cutter and is less likely to jam, bind, or suffocate.The paddles on E/One’s cutter wheel stir the waste water, which helps keep the tank clean and prevents sediment build up.E/One’s grinder does not require sharpness to function properly and is a true macerator as opposed to a slicer. Slicers do not function properly once blade edges are dulled.


Small 63.5 mm diameter cutter wheels have a much higher inlet velocity of 6.94 mm./sec, which leads to more jamming, binding, and suffocating.

Higher velocity wheels wear faster and produce less stirring, leading to more retained sediment in the tank.

What’s Different about the E/One Grinder Pump vs Other Grinder Pumps?

Pump Curves

How the E/One pump curve compares to centrifugal grinder pumps. Download the E/One pump curve