Feed water, needed for injectors operation, is supplied by buster pump and conducted through the injectors venturi tube. Inside of this tube feed water energy is transformed, creating the low pressure zone (vacuum) inside of suction chamber. The size of vacuum depends on pump pressure and nozzle size. Generated vacuum opens injector's non-return valve and draws chlorine gas from the vacuum installation. Injector is equipped with built-in non-return valve which prevents feed water penetration into the vacuum installation. This valve closes if there is a decrease of the vacuum value or at the moment of system standstill. It is recommended to install the injector directly at dosing point. Upon user request it is made in capacities up to 20 kg/h.