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Resources >> Calculations and
Tables >> Sizing Metering Pumps for Chlorination
Household Bleach
is 5 1/4% Sodium Hypochlorite
Liquid Pool Chlorine
is 12 1/2% Sodium Hypochlorite
For best results
use 12 1/2% certified chlorine manufactured for potable water. In computing
your metering pumps settings and solution strength, keep in mind that
its best to make up fresh solution once a month. The chlorine solution
loses strength as it ages, and is sensitive to heat and light. Generally,
keep solution tank out of the sun and use fresh solution at least once
a month for best results.
How To Figure
out What Size Pump to Use, and How To Set the Speed and the Stroke To
Achieve Proper Dosage:
- Step One: Determine
Flow Rate of the water stream you are injecting into, in Gallons
Per Minute (GPM)
or Liters Per Minute (LPM)
- Step Two: Determine
the parts per million of chlorine you are trying to achieve (PPM).
- Step Three: Use
the formula below to compute the gallons per day and select the pump.
- Step Four: Adjust
the output of the meterng pump to achieve proper dosage.
Multiply the FLOW RATE
(GPM) times the Applied Dosage in Parts Per Million Desired times 1440.
Then Divide by the Solution Strength being used. Household bleach is 5
1/4%, Pool Chlorine is 12%. If you dilute the solution by using 19 gallons
of pure water to 1 gallon of pool chlorine, you end up with a solution
strength of 0.6%. You can vary the applied dosage of chlorine by adjusting
the solution strength and by adjusting the speed knob and/or the stroke
knob of the metering pump. If both the speed and stroke knobs are set
to 100%, then the metering pump will deliver 100% of its rated output
in gallons per day. After you use the formula below to compute the gallons
per day adjust the knobs to end up with the desired dosage.
12 GPM x 1.5 PPM
x 1440 / (1,000,000 x .0525) = 0.49 Gallons Per Day
Divide the Gallons
Per Day figure by the Rated Maximum Output of the Metering Pump: For
Instance: Using Model P50-0005 which has a maximum output of 10 Gallons
Per day 4.9 divided by 10 = .49 or 49% SO! You could set the metering
for 49% of its rated output by adjusting the Speed Knob to 49 and the
Stroke Knob to 100; or by setting the stroke to 70 and the speed to
70 because 70% times 70% equals 49%.
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