PAC and polyamine dosing selection is the single biggest lever on water treatment efficiency and cost. This guide gives plant managers and engineers the practical parameters — jar testing, dose ratios, pH windows and troubleshooting — to optimise a coagulant-flocculant programme with confidence.

What You Need to Know About PAC & Polyamine

Polyaluminium chloride (PAC) is a polymeric inorganic coagulant with high positive charge and a wide working pH range; its performance is measured by Al2O3 content (typically 28–31%). Polyamine is a cationic organic polymer used to neutralise charge and bridge flocs. Choosing and dosing them correctly depends on raw-water quality, treatment goal and process conditions.

Why Careful Selection Drives Efficiency

• Cost control. Correct grade and dose minimise chemical spend per m³.

• Performance. The right pairing delivers clearer water and lower residual turbidity.

• Sludge reduction. Optimised dosing means less sludge to handle.

• Reliability. Robust dosing survives seasonal water changes.

How to Select & Dose Correctly

Step 1 — Run a Jar Test

Test your actual water across a PAC dose series, then add polyamine to find the optimum combination and mixing energy.

Step 2 — Fix Injection & Mixing

Inject PAC at rapid mix (G 300–600 s⁻¹) and polyamine at slow mix (G 20–70 s⁻¹). Use controlled dosing pumps.

Step 3 — Monitor & Fine-Tune

Track turbidity, colour and cost per m³, and re-tune as water quality changes through the year.

Frequently Asked Questions

Conclusion

Efficient treatment is engineered, not guessed. With disciplined jar testing, correct injection and continuous monitoring, PAC and polyamine deliver their best. Reach out for a selection and dosing guide tailored to your plant.