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Top > Birm Non-Chemical Iron Filter Systems > Determining Your Well Pump Flow Rate |
The flow rate of the water must be measured and done so accurately to insure that the filter will backwash and clean the media properly. Otherwise you potentially make a bad purchase choice.
Always make sure you know the filter backwash rate before buying the product.
The well water flow rate is determined by (a) counting the gallons drawn and (b) timing the pump cycle. What is timed is the entire time that the pump runs, from the start of the pump cycle (pump on), to the end of the pump cycle (pump off). Or in other industry recognized words, the time between the cut in point (pump on) and cut out point (pump off) of the well pump cycle. You will need a bucket or gallon jug and a second hand on a watch, clock or stop watch. Allow the well pump to build up to full pressure (pump runs and then shuts off). Then make sure that no water is being used from the time that the pump stops. Then, open a spigot at the pressure tank or at a nearby fixture, capture the water, and then measure the number of gallons drawn until the well pump turns on. When the pump turns on, immediately close the spigot or faucet and time the period it takes for the well pump to shut off, that is, between cut in (pump on) and cut out (pump off).
The formula for determining well flow rate: (Gallons drawn) divided by the (number of seconds timed for the pump cycle), then multiplied by 60 equals the gallons per minute (GPM) that your pump produces.
Example One: If 8 gallons are drawn and it takes 45 seconds to build pressure back up, then: 8 divided by 45 = 0.178. Then multiply 0.177 x 60 = 10.7 gallons per minute well pump flow rate.
Example Two: If 5.5 gallons are drawn and it takes 38 seconds to build pressure back up, then: 5.5 divided by 38 = 0.145. The multiply 0.145 x 60 = 8.7 gallons per minute well pump flow rate.
Note: Do not flow water from an outside faucet and try to determine the well flow rate this way. The 1/2" plumbing line and pressure tank will not provide accurate information if done this way!
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