Feed Pump Dosage

Simplified View

Chemical feed pumps are most often used to inject oxidizing agents (chlorine, hydrogen peroxide), pH adjusters (soda ash) , or sequestering chemicals (polyphosphate) into a water supply on a controlled and consistent basis. The pump operates in conjunction with the well pump or with a sensing device (like a pressure switch), so that the injected agent is added to the water stream only when the well pump is running or there is flow in the water line.

There is a standard formula for deciding the size and adjustment of metering pumps.

To apply this formula you need to know:

1. The output rate of the well pump,
2. The required dosage, in parts per million (ppm), and
3. The strength of the solution being fed, in ppm.

Here is the formula:

A. The Well pump output rate in gallons per minute times
B. The Required dosage in parts per million times,
C. the number of Minutes per Day (1440), divided by
D. The Solution Strength in parts per million, which equals
E. The Needed Metering Pump Output in gallons per day (GPD).

For a more elaborate description with examples and suggestions for purchasing and setting feed pumps, please go here.