The pool water must be clear and totally free of both visible and invisible dirt. Visible dirt is mainly removed by the pool filter. The invisible dirt is made up not only of bacteria, which can multiply very rapidly and cause problems, but also algae and fungi of various kinds which spread to the pool, where they find the conditions pleasant. Chemical agents are used to combat and control these.
To make sure the water in the pool is crystal clear and clean, it needs to be chemically treated for:
Grease detergents that effectively remove dirt at the waterline and the removal of dirt, leaves, etc.
Disinfecting agents work at their best within a narrow range of pH. The water must be neither too acid nor too basic. The ideal pH range for the pool and the human body is between 7.2 and 7.6.