### Chlorine Metering Pump Sizing - Residential Well

2021-5-13 · There are 1440 minutes in one day and the formula will tell you how many gallons of chlorine you will use for every 24 hours the well pump runs. This is useful because the metering pumps are rated in output per 24 hours. The formula is: 12 GPM x 2.0 PPM x 1440 and then divided by 5,000 = 6.9 Gallons Per Day.

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