In addition, turbidity can seriously interfere with the efficiency of disinfection by
providing protection for organisms, and much of water treatment is directed at removal
of particulate matter before disinfection. This not only will increase the efficacy
of disinfection by chemical disinfectants such as chlorine and ozone, but is an essential
step in ensuring the effectiveness of physical disinfection processes such as ultraviolet
irradiation, because light transmission through water is impaired by particulates.