Septic tank pumps are submersible pumps installed in a separate chamber outside the main tank or in the last chamber of the septic system. They are designed to remove water build-up from basements and crawlspaces and safely deposit it through the waste water system of a house, basically they are used to transfer sewage liquids and solids from one place to another. They are centrifugal pumps, with special design enabling solids to pass without clogging the pump. When the pump is turned on, the motor starts to rotate the impeller, creating the pressure that pushes water into the impeller and goes into the discharge pipe. Depending on the model, the voltage can be 115, 230, 460, or 575 volts. The pump housing, which contains a motor and an impeller, is made with cast iron and is built for long term use. Some of the major benefits of having a septic tank pump are; preventing flooding damage, reducing the threat of mold and mildew, and reducing the risk of fire in the system.