Tuesday, November 27, 2012

Need Help With Chlorinator Pump Settings

Hello Gerry,

We have a well with a pump that pumps 110gpm app'x every 5 to 6 minutes or 10-12 times P/H the chlorine pump is activated by the well pump solenoid and also runs 1 min cycles it injects 33 cubic inches to the 110 gallons per cycle. the chlorine mix tank has a capacity of 120 gallons asto which we add 2.5 gallons of 12.5%to the 100 gallons. We would like to maintain a final chlorine residual of 1.25 ppm in the final water how much additional chlorine must we add to do this.


Ed -  Here is a link to our chlorine calculator, you can find out what to set the pump and solution strength:

The first step is to find out how many liters or gallons per hour or per day your metering pump can pump. 

chlorinator pumpAssume your chlorine metering pump can pump 24 gallons per day (“GPD”).

Assume you diluted your bleach by adding 1 gallon of bleach for every 9 gallons of water.  You are using 12.5% bleach, so after the dilution you would have 1.25% bleach.  This is the same as saying 12,500 PPM.

You know already you want to inject 1.25 PPM of chlorine so the calculation (see the link for more information).


You already know you have 110 GPM.


Here is the calculation:

110 GPM  x 1.25 x 1440 (minutes in one day) divided by 12,500 (which is 12.5% diluted 1:9): 15.8 gallons per day pump required.  So assuming you had a chlorinator pump that can pump 24 GPD, you would divide 15.8 / 24 = 66% 

Most metering pumps can be adjusted to get the desired output. So to get this applied dose of 1.25 PPM, at 110 GPM flow rate, using 1.25% chlorine solution, you would set your pump at 66%.