Sewage Pump Buying Guide

Sewage systems often fall into the category of complex, mission-critical infrastructure. Selecting and installing the pump correctly is crucial for reliable waste management.

Learning the differences between sewage pumps and how to choose the right pump is crucial before starting your project.

Sewage Ejector Pump vs Grinder Pump

The first step in picking the best sewage pump is determining the nature of your waste, the system's location, and the volume it needs to process.

The Standard Sewage Ejector Pump

Unlike a standard sump pump—which is only designed to handle clear water or greywater—a sewage ejector pump is built specifically to manage waste solids and debris. Sewage pumps are designed with two critical features:

• Handling Capacity: They typically have an inlet size designed to pass a two-inch solid.
• Torque and Material: They are engineered to run less often than a sump pump but with significantly more torque and power to eject water containing solids. For reliable, long-term performance, choose a pump made with heavy-duty materials like cast iron.

Sewage ejector pumps are best used in two key scenarios: basement bathrooms and septic systems. When installing a bathroom below the main sewer line, a pump is needed to move the waste up and out of the house. For homes without public sewer access, a basement sewage pump helps move waste from the house into the septic tank.

The Grinder Pump

A grinder pump operates with the added benefit of metal blades that shred everything being sucked through the pump. While they are often necessary for residential homes dealing with modern items like wipes and feminine products, they are the standard for high-risk applications.

Think of grinder pumps as the go-to for commercial applications like bars, restaurants, and hotels. In public or other settings where people may flush food, tough materials, or stray garnishes, a grinder provides the added security needed to prevent costly clogs and repairs.

Regardless of application, a high-quality grinder pump is engineered to take only what it can handle and features mechanisms to kick away hard, non-grindable objects like small toys, protecting the pump's internal components.

Sewage Pump Sizing & Installation

Choosing the right pump is the first step; precision installation is the second.

Sump vs. Sewage

One fundamental rule to keep in mind: a sump pump should never be used for a sewage application because it cannot handle waste solids. The inverse, however, is possible under specific conditions—an appropriately sized sewage pump can work in a sump application if you need to manage a high flow of clear water that overwhelms a standard sump pump.

Sizing and Piping for High Flow

When using an oversized sewage pump to handle extreme water flow, a standard-sized sump basin won't be sufficient. The basin should be enlarged, typically to a minimum of 18 inches wide by 30 inches deep.

High-flow rates require a minimum two-inch discharge pipe. Larger pumps may require a three- or four-inch diameter to efficiently move the volume of water, ensuring the pump runs at maximum efficiency.

SAFETY TIP: For all basement bathroom installations, keep in mind that gas and odor are natural byproducts of waste. To safely remove these elements, a vent pipe running out of the home is necessary.

By focusing on these core principles of selection and installation, you gain the peace of mind that comes from a durable, high-performing system.