Low pH drinking water As per ...

Low pH drinking water

As per Mr. Maqbool Hussain comment, more important than the technical problem (Pipe corrosion) is the health problem. That water is producing indesirable effects on the health of the consumers.

People involved in water supply have a moral responsability with consumers, and thus, water must be delivered in a healthy way.

It's clear that the water must be conditioned, and apart of raising the pH,  Langelier Index, alkalinity and hardness must be taken to acceptable levels.

Lime or calcite must be added in order to achieve the above goals.

Depending of the amount of CO2 in the water, CO2 addition could be needed as well.

Lime has a lower capex but higher opex than calcite. (Lime needs double amount of CO2 than Calcite).

Water must be conditioned until reaching the equilibrium state (No changes with time), this means that the final state will have the same amount of CO2 than the atmosphere.