PAC 28% vs 30%: Which Polyaluminium Chloride Grade is Right for Your Water System?
In the world of industrial water treatment, selecting the right coagulant is a balance between chemical efficiency and operational cost. Among the most debated topics for procurement managers and engineers is the water treatment chemical specification—specifically, the choice between PAC 28% vs 30%.
While the 2% difference in Alumina ($Al_2O_3$) content might seem negligible on paper, it significantly impacts solubility, dosage precision, and the total cost of ownership. In this guide, we break down the technical nuances to help you make an informed decision for your facility.
Understanding the Basics: What Do the Percentages Mean?
Polyaluminium Chloride (PAC) is typically graded by its Al2O3 content.PAC 28%: Generally referred to as industrial grade PAC. It is often produced via the acid method and is widely used for wastewater treatment where high purity is not the primary concern.
PAC 30%: Often produced using spray-drying technology with high-quality raw materials. This grade usually features lower water-insoluble matter and higher basicity.
| Feature | PAC 28% (Industrial Grade) | PAC 30% (High Purity/Spray Dried) |
| Production Method | Roller Dried / Drum Dried | Spray Dried |
| Water Insoluble Matter | Higher (up to 1.5%) | Very Low (< 0.3%) |
| Appearance | Dark Yellow to Light Brown | Bright Yellow Fine Powder |
| Core Application | Industrial Wastewater, Mining | Drinking Water, Precision Manufacturing |
| Dosage Efficiency | Standard | High (requires 10-20% less volume) |
When to Choose Industrial Grade PAC (28%)
Industrial grade PAC is the "workhorse" of the chemical world. It is the most cost-effective solution for large-scale operations where the precision of the flocculent is secondary to the volume processed.
Best for: Municipal sewage, paper mill effluent, and coal washing wastewater.
Advantage: Significant savings on raw material costs for systems that can handle slightly higher sediment/insoluble matter.
When to Choose PAC 30% (High Purity)
If your system involves delicate machinery, membranes, or drinking water standards, PAC 30% is non-negotiable.
Best for: Drinking water treatment (potable water), pharmaceutical waste, and high-end industrial processes.
Advantage: Because it is spray-dried, the particles are finer and dissolve almost instantly. This prevents clogging in dosing pumps and pipes, reducing long-term maintenance costs.
The Hidden Factor: Basicity and Floc Formation
Beyond the Al2O3 percentage, the basicity (or alkalinity) plays a crucial role. High-purity PAC 30% typically has a more controlled basicity range (50% - 90%). This allows for:
Faster formation of "flocs" (clumps of impurities).
Better performance in low-temperature water.
Smaller sludge volume, which reduces disposal costs.
Conclusion: Which One Should You Buy?
The choice between PAC 30% vs 28% ultimately depends on your specific water treatment chemical specification requirements.
- If you are treating heavy industrial waste and are focused on the lowest price per ton, PAC 28% is your best bet.
- If you are looking for efficiency, lower dosage rates, and system longevity, the higher activity of PAC 30% often pays for itself by reducing chemical waste and equipment downtime.
Why Partner with OneSchem?
At OneSchem, we specialize in both roller-dried and spray-dried Polyaluminium Chloride. We understand that every water system is unique, which is why we provide:
- Customized TDS/MSDS for all export grades.
- Free Sample Testing to help you determine the exact dosage for your water type.
- Global Logistics expertise to ensure your chemicals arrive safely and on time.
Ready to optimize your water treatment process? Reach out us for a free consultation and a competitive quote on our premium PAC range.