Chlorine Enhancer


Adjust the pH of water so chlorine becomes 100 times more effective.


  • Pre-mix the appropriate amount of Cotey Chemical's WEL-CHLOR and water in an above-ground tank to yield a 200 ppm solution. Stir until dissolved.
  • Add the required amount of CHLORINE ENHANCER (see the chart below) to the tank solution and stir until well-blended.
  • Pour the pre-mixed solution into the well.
  • Leave the solution in the well for 5-7 hours. If possible circulate the solution in the well with the pump every few hours.
  • After treating, the initial water contains spent chemical and should be pumped to waste. Adhere to local, state and federal regulations. Once the well is clean, test for bacteria. Studies have shown that to successfully chlorinate a water well use a 200 part-per-million chlorine concentration. In order to achieve a 200 ppm concentration and to determine how much CHLORINE ENHANCER is needed, use the following table. It's very important to follow this chart because too much CHLORINE ENHANCER could lower pH values into a range that may evolve harmful gases.
Water (gallons) Granular Calcium Hypochlorite (65% available chlorine) Sodium Hypochlorite (household bleach) (5% available chlorine) Sodium Hypochlorite (10% available chlorine) Chlorine Enhancer
1 0.04 ozs. 0.13 fluid ounces 0.25 fluid ounces 0.06 ozs
125 5 ozs. ½ gallon 1 quart 7.5 ozs
250 10 ozs. 1 gallon ½ gallon 15 ozs
500 20 ozs. (1 lb 4 ozs.) 2 gallons 1 gallon 30 ozs (1 lb 14 ozs)
1000 40 ozs. (2 lbs 8 ozs.) 4 gallons 2 gallon 60 ozs (3 lbs 12 ozs)

Note: One lid full of CHLORINE ENHANCER (from the 10-lb container) is about 7 ounces.

For Best Results:

In an above-ground tank, pre-mix a solution of WEL-CHLOR, CHLORINE ENHANCER and water that would approximate three times the volume of water in the well. Add this to the well. If the above-ground tank is not large enough it may be necessary to make several smaller batches.

Why this chemical is important:

Sodium or Calcium Hypochlorite are the most common sources of chlorine used in our industry today. When either are added to water both hypochlorous acid and hypochlorite ion are produced. Hypochlorous acid (HOCl) is much more effective against bacteria - over 100 times more -than the hypochlorite ion. But, the amount of HOCl produced depends on the pH of the water. Above pH 7.5 very little chlorine occurs as helpful hypochlorous acid, but rather as ineffective hypochlorite ion. Therefore, the pH of the water should be kept between 6.0 and 7.5 to ensure good results. If the water gets below 6.0 chlorine gas may be formed which is dangerous for workers.

CHLORINE ENHANCER is specially formulated to lower the pH of water so HOCl may be produced. By carefully following the use instructions you will receive maximum benefit from your chlorine application. Whether using calcium or sodium hypochlorite to chlorinate the well, not as much is needed, thus your equipment is safer, you are safer and you save money.

How to dispose of Cotey's CHLORINE ENHANCER:

Waste testing showed that less than 50 ppm residual chlorine presents no hazard to crops whereas fish are susceptible in ranges from 0.1 to 5.0 ppm, depending on pH, dissoved oxygen, temperature and synergism/antagonism of other pollutants. Therefore, waste should not be pumped into streams and should be thoroughly dilluted if pumped onto fields. Cotey Chemical recommends that waste be pumped to sewage or barrow ditches for natural evaporation, or to local pits for evaporation and then filling provided filtration won't contaminate a local aquifer. In all cases waste should be thoroughly diluted. Adhere to local, state and federal regualations.


Corrosive. Keep out of reach of children. May be fatal if swallowed. Do not breathe dust. Use splash goggles and rubber gloves when handling this material. Avoid contact with eyes. May produce chemical burns. Do not get in eyes, on skin or on clothing. Use in a well ventilated area. Always use proper dosage because dangerous gas could be produced if pH of solution is too low. Never add CHLORINE ENHANCER to concentrated chlorine (concentrated calcium or sodium hypochlorite).

Proper U.S. DOT Shipping Name:
Not regulated by the DOT.