WHO guidelines   Hello ...

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WHO guidelines

 

Hello Nathalie,

disinfection of wells could be very tedious job if contamination is very high. Some time it is better to dig new wells. first step should be to determine the type and level of contaminations. You can simply fallow the guidelines provided by WHO

http://www.who.int/water_sanitation_health/publications/2011/tn1_cleaning_disinfecting_wells_en.pdf