Dosing system for the dust-free dosing of powdered activated carbon (PAC) to eliminate all organic impurities from the water as combined chlorine and/or chlorinated organics (THM). Dosing directly from 60 l drum by a dosing screw. The unit produces an app. 2% suspension that is either conveyed directly to the filter a at a low back pressure or to a buffer tank from where the suspension is dosed. The level of the buffer tank is controlled automatically. The unit is especially suitable for stand-by operation of for batch operation.