Water disinfection can be performed with various disinfants. Chemical disinfectants are chemical substances which are used to kill or deactivate pathogenic microorganisms.
Copper/ silver ionisation
Other disinfectants include ozone and UV.
More information on water disinfection?:
What is water disinfection? Necessity of drinking water disinfection History of water disinfection Waterborne diseases Factors that influence disinfection Conditions of water disinfection Regulation drinking water disinfection EU USA