I run two of these in my pond
http://www.sumppumpsdirect.com/Red-Lion-RL-SC33V-Sump-Pump/p7574.htmlThey 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.