What size pump do I need for my pond?

When choosing a pump for your pond, there is a relatively easy formula for you to use. Basically, what you are looking to do is turn half of the total water volume in your pond once an hour. So for example, if your pond has a total of 1,000 gallons of water, you would probably need to use a pump with a G.P.H. (gallons per hour) rating of 500 gallons.