The Matala "Muck Buster" Vacuum II is a powerful 2 H.P. pond vacuum designed to clean ponds up to 2000 gallons. It can lift small pebbles and vacuum leaves and organic waste from the bottom of your pond. It has a 5 gallon capacity and as the tank fills it will automatically shut off and drain the dirty water out the back to your grass or a drain. When it is empty it turns itself on automatically again and continues to vacuum again. The on/off cycle is approx. 40 seconds vacuum and 20 seconds drain out.