Usually a chlorine based chemical is used. But chlorine doesn't kill it all. See link for more.
chlorine or the filter
chlorine
Chlorine is used in swimming pools to kill bacteria and other microorganisms that could cause infections or illnesses. It acts as a disinfectant by breaking down biological contaminants in the water.
Chlorine is the most used (to disinfect and keep clean), but Bromine is also used.
Chlorine.
Chlorine is used in swimming pools to disinfect the water by killing bacteria, viruses, and algae. It helps to keep the water safe and clean for swimmers by preventing the spread of diseases and maintaining water clarity.
to keep the water clean and kill germs
Chlorine is generally added to swimming pools and other water attractions in order to keep the water clean. Doses of chlorine typically come in small tablets.
Chlorine is used in swimming pools for a few reasons. The most common are: 1. Chlorine acts as a mild disinfectant, it makes swimming in the water a more sanitary activity. 2. Chlorine also inhibits the growth of algae. Without chlorine, most pools would be green within a few days.
Chloride is put in pools to keep you away from bacteria,example:athlete's foot.It also protects your skin and eyes.Chloride can damage your hair,so the best thing to do is to wash it after swimming. I hope I've helped.
HOCL or hypochlorus acid
*clean chlorine.