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Binaya, Fundamentally you will need to increase the water pH by applying either ground limestone (calcium carbonate) or soda ash (sodium carbonate) depending on what is more readily available to your community. If you use limestone you will need also to consider the impact this has on water hardness. Likewise if you are using soda ash then you may have to consider the salt content of the water and it's health implications if you are requiring high doses to have sufficient impact on the pH. The UK guideline for Na is 200mgNa/l at the tap but this may vary in the country in which you are based. I hope this is of help. If you can provide more information on this project including location, water source, cause of low pH (if known) and the need for disinfection. we may be able to give more specific guidance. Kind regards Harriette