Chemical Dosing Disinfection Systems Chemical Dosing Disinfection Systems are the systems used for dosing “Teknophos SC 25” chemical used for the microbiological treatment in drinking and service waters. Its advantage over the ultraviolet systems is that its balance remains in the systems providing continuous protection. Chemical dosing can be made in three ways. 1. According to the amount of use 2. With the timing 3. Automatic control systems are the possibilities for disinfection.