How to Choose High-Quality Poly Aluminium Chloride

Poly Aluminium Chloride (PAC) is a high-efficiency coagulant widely used in municipal wastewater, industrial effluent, and drinking water purification. However, there are many PAC products on the market—different colors, grades, and Al₂O₃ contents—making it hard for buyers to choose. So, how do we tell good PAC from bad? Here’s a complete guide for global buyers and engineers.

✅ How PAC Works in Water Treatment

PAC removes turbidity and suspended solids through:

• Charge neutralization
• Adsorption and bridging

It destabilizes particles and forms large flocs, especially when used with PAM (polyacrylamide), to improve settling speed and clarity.

✅ 6 Key Factors to Judge PAC Quality

1. Color of Powder

• 💛 Golden yellow: Usually 28–30% content, made from pure raw materials
• 🟫 Brown or dull yellow: Often 26% or lower, made from by-products like aluminum ash

▶️ Lighter color usually means better quality—but confirm with lab results.

2. Drying Method & Moisture Level

• 🌬️ Spray-dried: Dry, free-flowing powder, high purity, dissolves fast
• 🔄 Drum-dried: Moist, sticky texture, lower active content

3. Clarity After Dissolving

• Good PAC solution = clear and transparent
• Poor PAC = cloudy, with floating or settled particles

4. Insoluble Matter

• High-quality PAC has very little visible residue after mixing
• More residue = lower purity

5. Aluminium Oxide Content (Al₂O₃)

• This is the core quality index
• Common grades: 26%, 28%, 30%

▶️ Higher Al₂O₃ = stronger coagulation + lower dosage needed

6. Basicity (%) and pH

• Basicity: 60%–90% (higher = stronger floc formation)
• pH of 1% solution: usually between 3.5 to 5.0

✅ Buying Tips for PAC

🧪 Always ask for:

• Third-party test reports
• Basicity, Al₂O₃%, moisture, and insoluble matter data
• Comparison test: dissolve a small sample and observe clarity and residue

📌 Don’t choose by appearance only!

🧾 Conclusion

With rising global demand for water treatment, choosing high-quality PAC is more important than ever. Use these 6 key tips to select efficient, cost-saving PAC products. 📬 Contact us for free samples or technical support.