ACH (Aluminum Chlorohydrate)

 

It is a group of specific aluminum salts used in deodorants and antiperspirants in cosmetic and as a coagulant in water purification. So it has two grades: daily-chem grade and water treatment grade. It is also used as a coagulant in water and waste water treatment processes to remove dissolved organic matter and colloidal particles present in suspension. Aluminum Chlorohydrate is best described as an inorganic polymer and as such is difficult to structurally characterize.

In water treatment, ACH is preferred in some cases because of its high charge, which makes it more effective at destabilizing and removing suspended materials than other aluminium salts such as aluminium sulfate, aluminium chloride, ferric chloride and other conventional coagulant and various forms of polyaluminium chloride in which the aluminium structure results in a lower net charge than aluminium chlorohydrate. Further, the high degree of basicity results in minimal impact on treated water pH when compared to other aluminium and iron salts.