Good coagulation effect of iron-free aluminum sulfate: under specific raw water quality, treated water quality requirements, and specific treatment process conditions, satisfactory coagulation effects can be obtained; non-toxic effect: when used to treat drinking water, the selected Iron-free aluminum sulfate coagulant must not contain ingredients harmful to human health; when used in industrial production, the iron-free aluminum sulfate coagulant chosen must not contain ingredients harmful to production.