I supply our pond with well water.. It produces about 35GPM
I'm able to run it 24/7 if needed. It will raise our 1.5 acre pond about 1/2 inch in 12 hours if I let it go.
I like to turn in on in the heat of the day to add a little oxygen and cooler water to my pond (not sure if it makes a difference)
Our pond is only 4 inches low after not having a drop of rain in 8 weeks with 100 degree Texas heat compared to neighboring ponds being a couple feet low..