What is the function of iron chloride hexahydrate in water treatment? What are its hazards?

Iron chloride hexahydrate is a brownish-yellow or orange solid with mild odor of hydrogen chloride; Highly hygroscopic and soluble in water; it is used mainly in the EU as flocculating and precipitating agents in potable and waste water treatment plants and paper mills; The mechanism of action of it is to hydrolyze in water to generate iron hydroxide colloid, which adsorbs and precipitates suspended particles, organic matter, heavy metals and phosphates in the water. Iron chloride hexahydrate has an irritant that may cause liver injury; Causes burns; Inhalation may cause corrosive injuries to upper respiratory tract; Harmful by ingestion.

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