Polyaluminum chloride is an unconventional coagulant that will soon be introduced to the US market. It is produced by partial hydrolysis of aluminum chloride and is thought to consist of stable cationic polymers of aluminum. The benefits of polyaluminum chloride relative to alum have been investigated as a function of pH, raw water composition, and mixing conditions. Conditions are outlined that might indicate the effective use of polyaluminum chloride instead of alum.
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Dempsey et al. (1985) studied this question.
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