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Trash Pump Buying Guide

Learn how to select the right diaphragm or centrifugal trash pump to efficiently move mud, silt, and heavy debris.

Carly Reynolds

Whether you're a homeowner tackling a flooded area or a professional managing a demanding job site, the need to move large volumes of water mixed with debris requires a specialized solution. A standard pump won't suffice; you need a trash pump.

What is a trash pump?

Trash pumps are engineered to pass water containing debris and other solids that would clog or damage conventional pumps. To select the perfect fit, you must first understand the main types available:

Types of Trash Pumps

Centrifugal Trash Pumps (Semi & Traditional)

Semi-trash and traditional trash pumps are the most common types. They use powerful impeller veins and large pump housings to move debris without grinding it up.

Semi-Trash Pumps: Get their name because they are limited to passing only small debris. They are excellent for muddy water with sand or small grit, but the housing isn't large enough for big items.
Traditional Trash Pumps: Feature larger impellers and housing, making them suitable for most job-site debris like pebbles and twigs. They often include easy cleanouts that you can open by hand to quickly remove any oversized items that cause a clog.

What is a diaphragm pump?

A diaphragm pump works entirely differently, acting as the specialized equipment for the toughest, muckiest jobs.

How They Work: Instead of centrifugal force, a diaphragm pump uses a diaphragm that moves up and down like a piston in an engine. The upstroke creates a vacuum, sucking the substance in, and the downstroke ejects it out.
Key Application: This unique action makes them the ideal choice for draining a pond, handling heavy silt, or moving sludge and extremely abrasive liquids that would wear down the impeller of a centrifugal pump.

When dealing with extremely heavy substances like sludge and mud, you must account for the added weight on the pump. The table below displays the impact of heavy solids on pump performance.