Quick Shop Fountain Pumps. Know Needed Pumping Performance GPH. Buy Fountain Pump Size By Spout Diameter Size Times 100 GPH.
Measure the diameter of the fountain spout with a tape measure. To calculate the gallons per hour, or GPH, multiply the diameter by 100. For example, if your fountain spout is 1 inch in diameter: 1 x 100 = 100 GPH, your pump will need to be rated at 100 GPH
If you are buying a pump for a waterfall, generally you will need 1,500 gallons per hour (GPH) for every 1 foot of waterfall discharge. If the width of the waterfall is 2 feet, the pump would need a gph of approximately 3,000 GPH.
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