The Tsurumi Clean Out Pump is used for anytime you need to empty your pond from water, sludge, sand and small debris with minimal clogging. Hooks up to a 2" x 50' folding hose sold.seperately. It has a high head height for getting water from the deepest ponds. This pump will run in 3.5" of water continuously, making this the pump of choice to clean out your pond. A Residue Kit will allow to pump the water down to .5 inches