I run two of these in my pond

http://www.sumppumpsdirect.com/Red-Lion-RL-SC33V-Sump-Pump/p7574.html

They run into a two inch and run about 2500 gallons per hour at ten foot of head. That about 120,000 gallons in 24 hours. I run one in the winter and two in the summer.

Cheers Don.

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7/8th of an acre, Perch only pond, Ontario, Canada.