PAC & ACH

1. PAC (Polyaluminum Chloride)

Full name: Polyaluminum Chloride
General chemical formula: Alₙ(OH)ₘCl₍₃ₙ₋ₘ₎

Function and use:

PAC is a coagulant used to purify water by binding fine colloidal particles to form flocs that are easily deposited.
PAC is used in:

• Drinking water treatment

• Industrial wastewater treatment

• Paper industry (for fiber separation)

• Textile industry (process water purification)

Advantages of PAC:

• Effective over a wider pH range (pH 5-9)

• Lower usage dose compared to alum

• Produces less sludge

• Does not lower the pH of the water too much

Disadvantages:

• Relatively higher price than alum

• Can leave aluminum residue if the dose is excessive

2. ACH (Aluminum Chlorohydrate)

Full name: Aluminum Chlorohydrate
General chemical formula: Al₂(OH)₅Cl

Function and use:

ACH is also an aluminum-based coagulant, with a higher active aluminum content than PAC.
ACH is widely used for:

• Premium drinking water treatment (e.g. bottled water)

• Industrial applications with high hygiene standards (food, pharmaceutical)

• Cosmetics (especially antiperspirants/deodorants)

Advantages of ACH:

• Has high basicity (70-83%), meaning it is more stable and efficient

• Produces faster and larger flocs

• Reduces dissolved organic content (DOC/TOC) better

• More dose-efficient than PAC

Disadvantages:

• More expensive than PAC

• Sensitive to pH extremes (less effective at pH < 5)

Brief Comparison of PAC vs ACH

Conclusion

• PAC is suitable for general use in water treatment plants as it is economical and effective.

• ACH is used for premium grade applications or high hygienic standards, where clarity and aluminum residues are strictly controlled.

• Poly Aluminum Chloride
  • PAC Liquid Industrial
  • PAC Liquid Drinking
  • Custom PAC
• Aluminum Chloro Hydrate
  • ACH Water Treatment
  • ACH Cosmetic