Poly Aluminum Chloride (PAC) Supplier in Pakistan

Pakistan has a water problem. Not just a shortage problem — though that is serious enough — but a water quality problem. Groundwater in large parts of Punjab and Sindh carries high turbidity, dissolved organic matter, and microbial contamination. Industrial effluent from textile mills, tanneries, food processors, and chemical plants gets discharged into already stressed water bodies. Municipal treatment infrastructure in many cities is ageing and under-resourced. And the consequence of all of this, ultimately, falls on the people and industries that depend on clean water to survive.

Into this challenge comes one of the most practically important chemicals in modern water management: Poly Aluminum Chloride, universally referred to in the industry as PAC. It is not a glamorous chemical. You won’t find it on the label of any consumer product. But it sits quietly at the heart of almost every serious water purification process in operation across Pakistan — municipal drinking water plants, industrial effluent treatment systems, textile processing units, paper mills, and more.

At AMZ Industries, we supply industrial and drinking-water-grade PAC to water treatment operations across Pakistan. This guide explains everything you need to know — what PAC is, how it works chemically, the grades available, its applications in Pakistan’s industrial and municipal sectors, and what to look for when choosing a supplier.

What Is Poly Aluminum Chloride (PAC)?

Poly Aluminum Chloride is an inorganic polymer coagulant — a group of polymeric aluminium salts with the general chemical formula:

[Alₙ(OH)ₘCl₍₃ₙ₋ₘ₎]ₓ

Where n is the number of aluminium atoms, m is the number of hydroxyl (OH) groups, and x represents the degree of polymerisation. This formula may look abstract, but its practical implication is significant: unlike simple aluminium salts such as alum (aluminium sulphate, Al₂(SO₄)₃), PAC contains pre-formed polymeric aluminium species with a high positive charge density. This is what makes it far more effective at coagulating negatively charged colloidal particles and suspended solids in water — the core job of any coagulant.

The global Poly Aluminium Chloride market was valued at USD 1.389 billion in 2024 and is expected to reach USD 2.082 billion by 2033, growing at a CAGR of 4.6%. That growth is driven by one fundamental reality: across Asia, the Middle East, and South Asia — including Pakistan — demand for clean water in both municipal supply and industrial discharge compliance is intensifying year on year.

Chemical & Physical Properties of PAC

Technical Specifications Table

How Does PAC Work? The Science of Coagulation and Flocculation

To understand why PAC is so effective, you need to understand why water gets turbid in the first place. Most contaminants that make water cloudy, coloured, or unsafe — clay particles, organic colloids, bacteria, algae, silt — carry a negative surface charge. These negative charges cause the particles to repel each other electrostatically, keeping them stably dispersed in water rather than clumping together and settling. This is why turbid water stays turbid on its own — the particles are actively resisting aggregation.

PAC works by disrupting this electrostatic stability through a two-stage mechanism:

Stage 1 — Charge Neutralisation

When PAC is added to water, it dissolves and releases highly positively charged aluminium polymer species — specifically Al₁₃ polycations, which carry charges of +7 to +13. These positively charged species are attracted to the negatively charged contaminant particles in the water. They adsorb onto the particle surfaces and neutralise the surface charge, collapsing the repulsive forces that were keeping particles apart.

Stage 2 — Bridging and Floc Formation

Once the surface charges are neutralised, the destabilised particles begin to collide and aggregate. PAC’s polymeric structure acts as a molecular “bridge” — linking multiple particles together into larger, denser aggregates called flocs. These flocs grow rapidly in size and weight, eventually becoming heavy enough to settle under gravity (sedimentation) or be captured by filtration media.

This two-stage mechanism — charge neutralisation plus polymer bridging — is what distinguishes PAC from simple coagulants like alum. Alum can only neutralise charge; it cannot bridge. PAC does both, which is why it produces denser, faster-settling flocs at lower doses, across a wider pH range, and in colder water conditions where alum performs poorly.

PAC vs Traditional Coagulants — Head to Head Comparison

The conclusion from this comparison is consistent with global industry practice: PAC consistently outperforms traditional alternatives like alum and ferric chloride across a multitude of critical parameters, particularly in applications where water quality varies seasonally or where strict residual aluminium limits apply — as in Pakistan’s drinking water standards.

Available Grades and Forms of PAC

By Form

Liquid PAC leads in large-scale municipal applications due to its ease of pumping and dosing. Powdered PAC is gaining traction for its higher stability and longer shelf life — an important consideration for operations in Pakistan’s more remote industrial zones where consistent supply logistics are challenging.

By Quality Grade

Basicity is the most critical quality parameter for operational performance. High-basicity PAC (70–90%) is optimal for high-turbidity water — the kind Pakistan’s rivers and canals carry during and after monsoon season. Low-basicity PAC works better for coloured but low-turbidity water, such as treated surface water and some groundwater sources.

Industrial Applications of PAC in Pakistan

1. Municipal Drinking Water Treatment

This is PAC’s flagship application globally and domestically. Municipal water treatment dominates the application segment due to high regulatory compliance requirements, and Pakistan’s major cities — Lahore, Karachi, Faisalabad, Multan, Peshawar — all depend on surface water sources (rivers, canals, reservoirs) that carry significant seasonal turbidity loads, particularly during and immediately after the monsoon.

PAC is dosed at the raw water intake of water treatment plants, typically using automated dosing pumps or gravity-fed dissolving systems. The coagulated and flocculated water then passes through sedimentation basins and rapid sand filters before chlorination and distribution.

Typical PAC dosage in municipal treatment:

PAC’s ability to operate effectively across Pakistan’s variable seasonal water quality — from clear dry-season groundwater to heavily silt-loaded monsoon river water — is one of its most practically valuable attributes.

2. Industrial Effluent Treatment

Pakistan’s industrial sector faces increasing regulatory pressure to treat effluent before discharge — driven by NEQS (National Environmental Quality Standards) enforcement and the requirements of international buyers in export-oriented industries like textiles and leather.

PAC is a primary treatment chemical for industrial effluent across Pakistan’s key sectors:

For textile effluent specifically — Pakistan’s single largest industrial wastewater challenge — PAC-based coagulation is typically the first step in a multi-stage treatment train: PAC coagulation → flocculation → sedimentation → biological treatment (activated sludge or trickling filter) → polishing.

3. Industrial Process Water Purification

Beyond effluent treatment, PAC is used to purify the process water that industries consume in manufacturing — ensuring incoming water meets the quality requirements of sensitive processes:

• Boiler feed water: Removing turbidity and suspended solids before softening and demineralisation
• Cooling tower make-up water: Reducing silt load that accelerates corrosion and scale in cooling systems
• Textile dyeing baths: Pre-treating water to remove iron and turbidity that can affect dye reproducibility
• Food and beverage production: Meeting food-grade water quality requirements at point of use
• Pharmaceutical water systems: Pre-treatment before reverse osmosis and distillation systems

4. Paper and Pulp Manufacturing

The paper industry uses PAC in two distinct roles:

• Water clarification: Treating process water and effluent from pulping and paper-making operations
• Retention aid: In the paper machine itself, PAC is used as a retention and drainage aid — improving the retention of fine fibres and fillers on the paper web, increasing machine productivity and paper quality. This application uses PAC’s charge-neutralisation effect on the negatively charged cellulose fibres and filler particles

5. Swimming Pools and Recreational Water

PAC is approved and widely used for swimming pool and recreational water treatment in Pakistan’s growing hospitality and sports facility sector. It maintains water clarity by coagulating fine particles that pass through sand filters, and is compatible with standard chlorine disinfection systems. At the correct dosage, it does not affect pool pH significantly — an important advantage over alum.

6. Oil and Gas — Produced Water Treatment

Pakistan’s oil and gas sector generates significant volumes of produced water — highly contaminated water that comes up with crude oil from reservoirs. PAC is used in the treatment of produced water to remove suspended solids, oil droplets, and scale-forming ions before reinjection or discharge.

Dosing and Preparation Guidelines

Getting PAC dosage right is critical — too little and you get incomplete coagulation and turbid treated water; too much and you waste chemical, potentially increase residual aluminium in the treated water, and create unnecessary sludge.

Preparing PAC Solution from Powder:

• Dissolve PAC powder in clean water at a ratio of 1:3 (PAC : water) to create a stock solution
• Allow to dissolve fully with gentle stirring — typically 10–15 minutes
• Further dilute with 10–30 times additional water before dosing to the treatment system
• Optimal dosing pH: 3.5–5.0 in the stock solution — but the raw water pH being treated can range from 5.0–9.0

Jar Test: Before committing to an operational dosage, always conduct a jar test — a simple laboratory simulation of the coagulation/flocculation/sedimentation process using the actual raw water to be treated. This determines the optimal PAC dose and verifies expected performance before full-scale application.

Storage, Handling, and Safety

PAC is one of the safer industrial chemicals in common use — it is not classified as a dangerous good for transport, is non-flammable, and carries relatively low acute toxicity. However, correct storage and basic handling precautions still apply.

Storage Requirements:

• Store powder grades in sealed polypropylene bags in a dry, well-ventilated warehouse — PAC powder is hygroscopic and will absorb moisture, leading to caking and reduced solubility
• Store liquid grades in HDPE tanks or lined steel vessels — avoid prolonged contact with mild steel or aluminium
• Recommended storage temperature: 5–35°C for liquid; ambient for powder
• Avoid freezing of liquid PAC — it can cause separation and reduced performance
• Shelf life: 2 years for solid grades, 12 months recommended for liquid grade

Personal Protective Equipment:

For complete safety data, refer to the PubChem PAC Safety Information and the WHO Drinking Water Guidelines on Aluminium — which sets the guideline value for residual aluminium in drinking water at 0.2 mg/L.

Why Source PAC from AMZ Industries?

For water treatment operations, the quality and consistency of your coagulant is not a minor operational detail — it is the foundation of your entire treatment process. PAC that has been improperly stored and absorbed moisture will have reduced solubility and lower effective Al₂O₃ content than specified, delivering weaker coagulation performance. Liquid PAC that has been frozen and thawed without proper remixing may have lost its polymeric structure. And industrial-grade PAC used in drinking water applications without verifying heavy metal limits is a regulatory and public health risk.

At AMZ Industries, we supply PAC with verified Al₂O₃ content and basicity specifications, clearly differentiated by grade — drinking water grade and industrial grade — so you’re never using the wrong product for your application. We can advise on the right form (powder vs liquid), the right basicity range for your raw water type, and the right dosing approach for your system.

We supply in 25 kg bags, 50 kg bags, jumbo bags, and liquid tanker quantities, with nationwide delivery across Pakistan to municipal water treatment plants, industrial effluent treatment facilities, textile mills, paper plants, and chemical manufacturers.