Also known as wastewater pumps, sewage pumps or sludge pumps, trash pumps are designed to transport liquids that contain hard and soft solids, such as leaves, twigs, pebbles, silt and mud. Most trash pumps are centrifugal pumps. Although water pumps move liquid at a higher pressure than trash pumps, water pumps often jam when used to move murky water or water that contains pebbles or other solids. Learn more in our Project Uptime article, Trash Pumps: 8 Things to Know When Choosing or Using One.