Question 1

What is Poly Aluminium Chloride (PAC) powder used for in water treatment?

Accepted Answer

PAC powder is a primary coagulant used in water and wastewater treatment to remove suspended solids, turbidity, colour, and colloids. When dissolved and dosed into raw water, PAC releases aluminium hydroxide species that neutralise the negative charge of suspended particles, causing them to aggregate into settleable floc. In Oman, PAC powder is the coagulant of choice for smaller water treatment plants in interior governorates, remote desalination pre-treatment systems, and construction site water treatment where liquid PAC storage is impractical. It is also used in PAEW municipal plants and industrial effluent treatment operations across Muscat, Sohar, and Salalah.

Question 2

What dosage of PAC powder is recommended for turbid water in Oman?

Accepted Answer

Typical PAC powder dosage ranges from 10–50 mg/L of raw water depending on the turbidity, temperature, and source water chemistry. For Oman's groundwater supplies (often moderate turbidity, 10–50 NTU), an effective dose is typically 15–30 mg/L as powder. High-turbidity surface water or seasonal floodwater (which can exceed 500 NTU in Oman's wadi floods) may require 40–80 mg/L. Jar testing is always recommended to establish the optimum dose for specific water conditions. Global Chemicals LLC provides jar test support and dosage calculations as part of our technical service to water treatment customers across Oman.

Question 3

How does PAC powder compare to liquid alum (aluminium sulphate) as a coagulant?

Accepted Answer

PAC powder outperforms liquid alum in three key areas: it requires 30–50% lower dosage by weight of active aluminium oxide, it works effectively across a wider pH range (5.5–8.5 vs. alum's narrower 6.0–7.5), and it produces less sludge volume. PAC also has lower alkalinity consumption, meaning treated water pH drops less with PAC dosing — important in Oman's low-alkalinity desalinated water systems. In cool conditions (Oman's winter months, water at 15–20°C), PAC forms floc faster than alum. The trade-off is that PAC powder costs more per kilogram than alum, but the lower effective dose typically makes it more economical overall.

Question 4

What packaging is available for PAC powder in Oman?

Accepted Answer

Global Chemicals LLC supplies PAC powder (28–30% Al₂O₃) in 25kg polypropylene bags for standard industrial and municipal water treatment customers. Pallet quantities (40 bags per pallet, 1,000 kg) are available for larger accounts with warehousing space. The powder has a shelf life of 24 months in sealed, dry storage conditions — a significant advantage over PAC liquid (6–12 months shelf life) for remote locations and projects with infrequent supply. Custom pack sizes may be available for specific project requirements. Delivery is available to all Oman governorates including interior regions (Al Dakhiliyah, Al Sharqiyah, Al Wusta) and Dhofar.

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