Shock chlorination is a remedial or preventative strategy to disinfect water wells or distribution systems in order to control or prevent the growth of unacceptable levels of micro-organisms. When chlorination is properly conducted, the entire well casing, pump, distribution plumbing, and some water system equipment should be disinfected.
The biocidal effects of chlorine are most effective at pH levels of 5.5 to 6.5. However the addition of chlorine raises the pH of water. To buffer this effect during the disinfection process, a weak acid like vinegar (i.e. 5% acetic acid) can be added to the water in the mixing tank to reduce the pH. The addition of chlorine will raise the pH in the final mixing solution to the range needed for optimal disinfection.
This calculator incorporates a pH adjustment to calculate the volumes of chlorine and vinegar necessary for optimal disinfection.
Please note that if you are unsure of the disinfection process it is recommended that you use a registered well driller and/or pump installer to carry out the work.
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