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Aluminium chloride (AlCl3), (source Wikipedia) also known as aluminium trichloride, is the main compound of aluminium and chlorine.It is white, but samples are often contaminated with iron(III) chloride, giving it a yellow color. The solid has a
polyaluminium chloride (PACl, n=2 and m=3), aluminium chlorohydrate (ACH, n=2 and m=5), and polyaluminium chlorohydrate (PACH): similar to ACH. In practice, there is little difference between the performance of ACH and PACl in water treatment
