A large amount of alum sludge slides along the wall of the inclined pipe (sloping plate) to deposit in the trough, and the upper water flows into the trough through the serrated partition for further processing. (2) flocculation stage: // www. Dosage determination, under the same conditions. (1) The coagulation stage, refer to the amount of solid PAC, the two are basically the same, requiring full contact with the source water and pharmaceutical and mechanical stirring pump speed moderate, too fast speed broken broken alum speed is too slow reaction inadequate water quality Poor: the polymerization of ferrous sulfate injected into the mechanical reaction tank and the source of water rapid coagulation process of the formation of alum particles: Alum turn into dense particles larger process, appropriate turbulence and sedimentation in the pool long enough to stay a quarter of an hour. When used to prepare a good liquid, through the metering pump into the source of water in the mechanical reaction tank coagulation reaction. The coagulation process of the three stages of the hydraulic conditions and the formation of alum situation, need to identify the speed in practice, the specific polymerization of ferric sulfate classification and dosing methods to (3) Settlement stage: the sedimentation tank and the supernatant Mud sedimentation process of separation and disposal. Slow flow, in order to improve the separation efficiency generally use honeycomb inclined tube (honeycomb inclined plate) sedimentation tank .Polymeric ferric sulfate solid plus tap water into the dosing tank, Stir to dissolve