Poolside Chat Episode 11: How Many GPM Does a Pump Motor Push?

Video: Poolside Chat Episode #11 – What is My Motor’s GPM Rating?

This is Poolside Chat where every week we answer your questions on how to fix and maintain your swimming pool. Poolside Chat is presented by INYOPools.com, helping pool owners find the right parts since 2001. In today’s episode of Poolside Chat, Rob and Matt tackle another common swimming pool question:
  • What is the flow rate of my pool pump motor? Here’s a hint, it’s a trick question.

Now here’s your hosts – Matt and Rob.

Poolside Chat Episode #11 Video

Watch the video it’s easier than reading ;)

Debut of the black shirts:

How many gallons per minute does this motor push?

– Nick

Well Nick, unfortunately the motors are not rated in gallons per minute (GPM). The reason being, the motors are used on several different pump models and each system is going to have a different Total Dynamic Head and that’s going to affect the GPM.  To find the actual GPM you must find the flow curve of your pump, then find the GPM rating congruent with your total dynamic head.

(That was nerd talk for look at a graph).

Let’s say you have a UST1102 1 HP pump motor. This motor can be fitted to dozens of different pump models. So, within a litany of pumps there can be medium head, high head, and various plumbing sizes. All these categories add more variables that will change the GPM rating.

The best information to use in identifying your pump is its model number. On your pump’s housing, look for the model number (usually on a silver tag) or open the pump to find a part number on the impeller. The impeller part number will narrow the search to a few pump models. With the search field narrowed, review the parts breakdown page to determine the model that most resembles your pump. Once you find the match, look for the pump curve either on INYO’s website, or through a Google search.

Hope we answered your swimming pool pump and motor questions. If we didn’t, feel free to give us a call at 877-372-6038 or visit us at inyopools.com. Or, email any of your questions to upload@inyopools.com. Or, sign up and subscribe to our YouTube channel and you’ll get these videos and you also get a 128-page pool maintenance guide that will be emailed to you so you can print it out if you just have reams of paper that you just want to sing on through. Feel free to subscribe to us.

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