Submersible sand pump units can be directly installed in sewage ponds due to their submersion in liquid, eliminating the need for a dedicated pump house. This saves on considerable land and construction costs. They are easy to install and repair. Small submersible sand pumps can be installed effortlessly, while larger models typically come with automatic coupling devices for easy installation and maintenance. They offer extended operation times. The submersible sand pump's co-axial pump and motor, with a shorter shaft and lighter rotating parts, results in a lower radial load on the bearings, significantly extending their lifespan compared to standard pumps. They also do not experience cavitation damage or issues with water supply. This last feature greatly benefits operators. They produce minimal vibration and noise, have low motor temperature rise, and are environmentally friendly. In addition to the main impeller, a mixing impeller is added at the bottom, which sprays accumulated sludge into a mixture of water and solid particles.