What is the name of the Chinese Parliament?

Explanation :

The waste water is treated through several stages involving physical, chemical and biological treatments.

The pathogenic bacteria are eliminated during water disinfection and this disinfection is done by using chlorine and ozone as chemicals.

If these pathogens are not removed from the drinking water, it can causes several diseases, making the water unfit for drinking.

Final Answer:

Hence, the two chemicals used in the disinfection of water are chlorine and ozone.