When GPH just isn’t enough, HP steps in 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, n
