If polyaluminum ferric chloride is used for water treatment, the use method is basically the same as that of water treatment plant, especially for the enterprises using chemical coagulation method, there is no need to carry out major transformation on the original equipment, just need to add a alum dissolving tank. The general process is divided into the following stages: 1. Coagulation stage: in the coagulation stage, the water flow is required to form a strong turbulence, and the stirring speed in the beaker experiment should be above 250-300 rpm for 10-30s, no more than 2min. After rapid mixing, the water becomes more turbid. In this stage, polyaluminium ferric chloride solution and raw water quickly coagulate into fine alum in a short time. 2. Flocculation stage: different from coagulation stage, in flocculation stage, the stirring speed first drops to 150 rpm, lasts for about 6 minutes, and then drops to 60 rpm, and the stirring time is about 4 minutes, showing suspension state. This process requires a proper turbulence degree and a residence time of about 10-15min until the alum grows, coarsens, accumulates and sinks, and the flocculation layer and the surface clear layer begin to separate. 3. Sedimentation stage: in the sedimentation stage, the beaker experiment should be stirred slowly, 20-30 rpm is appropriate, first lasting for 5 min, and then remaining turbidity should be measured after 10 min. The sedimentation process requires slow water flow, and the use of inclined tube sedimentation tank can improve the efficiency better. If conditions permit, the air flotation method can be used, which has a better effect on the separation of flocs. 4. Enhanced filtration: in the filtration stage, the filter layer structure and filter aid should be reasonably used to improve the removal rate of the filter, which is an important link to improve the water quality. Finally, Gongyi filter industry Co., Ltd. reminds you that the storage environment of polyaluminum ferric chloride should be dry, moisture-proof and far away from heat source. Pay attention to anti-corrosion when using. The dissolution equipment and dosing facilities should be treated with anti-corrosion treatment, and the agent should be dissolved before use.