Simple definition: GPH measures how much water a pump moves in one hour, and is the standard spec used to size pond pumps.
Detailed Explanation
A common rule of thumb is turning over a pond’s full volume at least once every one to two hours, so GPH needs to be matched against actual pond volume, not just picked at random.
Why It Matters
An undersized pump (low GPH for the pond’s volume) won’t move enough water to keep filtration and aeration effective.
Practical Example
A 1,000-gallon pond generally wants a pump rated for at least 500 to 1,000 GPH, depending on stocking and filtration needs.
