Owing to spray drying products holding the following advantages: excellent stability, broad water area, quick hydrolysis speed, strong adsorption capacity, large alum, swift subsidence, low effluent water turbidity, super dehydration, performance and etc., throwing quantities of spray drying products can be reduced under the condition of the same water quality, meanwhile, when the water quality is bad, throwing qualities of spray drying products can be decreased half comparing to tumble drying products., which not only relieve the intensity workers, but also cut down use’s water rationing expenses. Beside the above mentioned, spray products which are suitable and reliable for drinking water can reduce water accidents to guarantee safety.