The Bottom Suction Pump from A.Y. McDonald Manufacturing was designed to provide maximum drawdown, and is available in 1/2 or 3/4 hp, along with a gpm of 15 and voltage of 115. It has quiet operation and is made of corrosion-resistant material for cisterns handling clean and dirty water, rainwater or pond water. 800/292-2737; www.aymcdonald.com.