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.
