Which disinfection method is preferred by contractors on NEW water mains?

Calcium hypochlorite tablets are preferred by contractors for disinfecting new water mains because they provide a stable and effective source of chlorine for water disinfection. This method is highly efficient in delivering the necessary chlorine levels to eliminate any pathogens present in the new piping system. The tablets are easy to handle and measure, ensuring consistent dosage and minimal risk of over-chlorination.

Using tablets also reduces the risks associated with handling liquids, such as spills or splashes, which can occur with liquid chlorine. Moreover, the stability of calcium hypochlorite allows for a longer shelf life, making it a practical choice for contractors who may need to store disinfectants prior to use.

In contrast, while sodium hypochlorite (in both powder and tablet forms) is another viable option for disinfection, calcium hypochlorite is generally favored in this context due to its superior stability and handling characteristics when dealing with new installations.