| Step One: |
Determine your solution strength.
For low flow rates of 10 to 20 gallons per minute, dilute the bleach. Pool
chlorine is 12% sodium hypochlorite, which also can be expressed as 120,000
parts per million (PPM). Household bleach is approximately 5% or 50,000
ppm. If you diluted pool chlorine, 1 part of bleach to 19 parts of pure
water, you would end up with solution strength of 6000 ppm. |
| Step Two: |
find out the flow rate of
the water you are injecting the chlorine into. Click
here to find out more information on how to determine flow rates if
you have a well and a pressure tank. A typical home water well flow rate
is around 15 gallons per minute. |
| Step Three: |
determine the amount of chlorine
you want to inject. The amount of chlorine that is required depends on the
level of contaminants in the water. The chart on the Chlorination
Work Sheet will help you in determining the applied dosage. For many
applications, 1.5 ppm is a good place to start. |
| Step Four: |
Metering pumps are rated in
gallons per day, or gallons per hour of how much chlorine solution they
can pump, if the pumps are adjusted to pump at 100% output. Apply these
values in the formula below, to find out how large a metering pump you need,
in other words, how many gallons per day the pump can pump. |
| Step Five: |
The formula is:
Flow Rate (in gallons per minute) times the Applied Dosage (in parts per
million) divided by 1440 (which is the number of minutes in a day). So assuming
a flow rate of 15 gallons per minute, a solution strength of 6000 ppm, and
an applied dosage of 1.5 ppm we could use this formula:
| 15 GPM X 1.5 PPM x 1440 |
|
|
|
= |
5.4 Gallons Per Day |
| 6000 PPM |
|
|
|
| Step Six: |
Now that we know the output
per day, (which is the same thing as output per 24 hours of well pumping
time) is 5.4 gallons per day, we can select the metering pump. |
| Step Seven: |
Many metering pumps have an
output of 10 gallons per day. Since we need a 5.4 gallon per day, we can
just adjust the speed and/or stroke of the metering pump to achieve the
desired output. |
| Step Eight: |
5.4 divided by 10 = 54%. |
| Step Nine: |
so if you wish an applied
dosage of 1.5 ppm, and your flow rate is 15 gallons per minute, and your
solution strength is 6000 ppm, and you adjust your 10 gallon/day pump down
to 54% output, using the speed control or the stroke control, you will achieve
your desired result. |
