How should calcium hypochlorite be introduced when disinfecting a new water main?

The most effective method for introducing calcium hypochlorite when disinfecting a new water main involves using it in a manner that ensures even distribution and proper contact with the water for effective disinfection. Specifically, gluing the tablet to the interior of the top of the main allows for slow and controlled dissolution of the calcium hypochlorite, which is essential for maintaining a concentration of chlorine that can effectively kill any pathogens present in the water.

This method ensures that the chlorine is released gradually as water passes through the main, providing prolonged disinfection and increasing the likelihood of reaching all areas of the water main. Proper dissolution and distribution are crucial in preventing bacterial regrowth within the water system, making this approach effective in achieving the desired disinfection results.

Introducing the disinfectant in other ways, like pouring it directly into the water main or mixing it in a tank before it enters the pipe, can lead to uneven chlorine distribution and may not provide sufficient contact time or concentration with all areas of the main. Moreover, the option of not using calcium hypochlorite at all misses the critical need for disinfection in new water mains to ensure safe water supply. Hence, placing the tablet in this way maximizes the effectiveness of the chlorination process during the dis