Polyaluminum Chloride (PAC) is an inorganic polymer coagulant for water treatment, produced by hydroxide-ion bridging and polymerisation of multivalent anions. It has a high molecular weight and high charge density, and is supplied as a solid (brown, beige, golden or white) or a liquid (colourless to yellowish-brown). Grades differ in colour and application.
1. High purity, safe and stable, compliant with national standards. 2. Fast floc formation, high activity, good filterability, no alkaline additive needed, unaffected by moisture. 3. Effective at low temperatures, varying pH, high turbidity and organic load. 4. Removes heavy metals and radioactive contaminants with low residual salts. 5. High active content, easy to store and transport.
6. Lower residual turbidity and dosage than alternative agents, with clear cost benefits.
1. Run a jar test to determine the optimum dose for the raw water; prepare solution freshly and set dosages for non-potable water case by case. 2. For solid product, make a 10–25% solution first, then dilute: add water, feed slowly and stir continuously.
3. Do not mix products from different manufacturers or grades, or store them with other chemicals.
4. Concentrate and diluted solution are mildly corrosive, less so than other inorganic coagulants.
5. Shelf life: 6 months for liquid, 2 years for solid. Solid product remains usable after absorbing moisture.
