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Choosing a hydroponic pump sized in horsepower

So you’re building a hydroponic or aquaponic system, and have done the calculations to size a pump. Let’s imagine that you’ve calculated your flow rates and decided that you need a pump capable of moving 2000 gallons per hour (GPH).

Most of the time, a GPH rating will help you find the pump you need. However, some pumps ditch the GPH rating for a horsepower rating (HP), and that’s when things get tricky.

For your 2000 GPH system, none of the submersible pumps you’ve researched will fit it. You’ve begun looking into larger inline pumps, but they’re all measured in HP.

There is no easy GPH to HP conversion, so you are stuck with what seems like an obsolete GPH. What do you do?

This article by Upstart University discusses the difference between GPH and HP rating, which pumps they apply to, and how to navigate pump sizing with both measurements floating around.