If the outlet spout is cleaned regularly with a disinfection liquid and the water supply is ok, the water dispensed from the cooler should be ok.
If for some reason the water supplied to the cooler was "not clean" some time ago, it might be necessary to do a complete disinfection of the cooler unit. We have a cartridge you can fill with a disinfection liquid. This cartridge you can connect between the water supply line and the cooler and then dispense different drinks for cleaning the system. Finally you disconnect the cartridge and flushing the system.