ACH Cosmetic

ACH Cosmetic is a term often used in the context of water treatment to refer to Aluminum Chlorohydrate (ACH) - an aluminum-based coagulant used to purify water. The word "Cosmetic" here signifies the high grade or purity of the material, commonly used in the cosmetics industry, but can also be applied to drinking water treatment or industrial process water if it meets safety standards.

Here is a more detailed explanation:

What is Aluminum Chlorohydrate (ACH)?

ACH is a polyaluminum compound with the general formula:

Alₙ(OH)ₘCl₍₃ₙ₋ₘ₎

ACH is a pre-polymerized coagulant - meaning that some of the aluminum ions have reacted beforehand to form the polymer structure. This makes it more efficient than alum (Al₂(SO₄)₃) or regular PAC.

Function in Water Treatment

In water treatment, ACH functions as:

• Coagulant: Binds fine particles (colloids) into large flocs that can settle.

• Purifier: Reduces turbidity and color of water.

• Heavy metal reducer: Can help precipitate Fe, Mn, or natural organic matter (NOM).

Advantages of ACH over other coagulants

Why is it called "ACH Cosmetic"?

"Cosmetic grade" indicates that the product is:

• Highly pure (high Al content, typically ≥ 23-24% Al₂O₃)

• Free of heavy metals and impurities

• Formulated to be stable and leave no residue

• Generally used in the cosmetics industry (deodorants, antiperspirants), but this version can also be applied for ultrapure water treatment, such as:

  • Pharmaceutical water

  • Electronic industry process water

  • Premium drinking water

Important Notes

• ACH Cosmetic is more expensive than ordinary coagulants.

• In water treatment, its use is considered when extreme clarity or low metal residue is required.

• Make sure the material has food-grade / NSF / Halal certificate if used for drinking water.