FIELD: water treatment. SUBSTANCE: invention relates to basic aluminum chlorides that can be used for treating sewages and natural water to remove suspended impurities and dissolved organic and mineral substances. Solid coagulator is prepared from liquid one by reaction of aluminum hydroxychloride with sulfates and chlorides, or yet natural bischofite, liquid aluminum hydroxychloride being taken at molar ratio 
equal to 1:(0.4-0.6). Reaction is carried out at medium pH varying from 4 to 6 and temperature from 20 to 80 C. EFFECT: enabled regulation of time required for transfer of liquid aluminum hydroxychloride into solid state thereby favoring process control. 4 tbl, 6 ex
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