Products are fine powders, particle uniformity, dissolution speed, basicity adjustment range, the flocculation effect is good, clean and efficient stable dosing less, and low cost. As the spray-dried product stability, water quality in the same circumstances, the spray-dried product to use less, especially in the case of poor water quality, spray-dried product dosage compared with the roller can be reduced by half, not only reduced the labor intensity, more importantly, is to reduce the cost of customer's water.