Coagulation with Prepolymerized Metal Salts
It has been known to mankind for 4000 years that alum and iron are useful in the treatment of water. Purified alum was, however, first manufactured in the fifteenth century. In England, treatment of muddy waters by coagulation/flocculation started in the mid-seventeenth century. Today alum (or iron) coagulation represents probably the most commonly used drinking water treatment process throughout the world.
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