One question that comes up often is “How do I know how many gallons per minute my well pump is pumping?” This is crucial information when purchasing or installing water treatment systems, as they all come in different sizes and have different requirements based on your flow rate.
For example, say your well pump has a maximum flow rate of 5 gallons per minute. This means you can fill a 5 gallon bucket in one minute. If you choose a backwash filter system that requires 10 gallons per minute for backwash you'll find that it won't work properly, because you need a system that functions on 5 GPM.
Luckily, determining your well flow rate is easy and only takes a few minutes:
If you cannot tell when your pump is turning on and off, you can use your pressure switch instead. Simply locate the pressure switch and remove its cover. [WARNING: Live voltage is under the pressure switch cover. Please DO NOT touch any of the live electric terminals inside.] Note that the pressure switch has four terminals that open and close as the pump runs. When these terminals are closed together, this means the pump is running; when they are open, the well pump is off.
To make your calculations even easier, we've provided a flow rate calculator on our website.
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