Description

Poly Aluminium Chloride– PAC Pool Coagulant & Clarifier

Product Data

Attribute	Verified Information
Product Name	Poly Aluminium Chloride (PAC)
Chemical Category	Coagulant / Clarifier
Active Ingredient	Poly Aluminium Chloride (PAC) — liquid or powder form
Chemical Formula	[Al₂(OH)ₙCl₆₋ₙ]ₘ (general formula)
Alternative Names	Polyaluminium Chloride; PAC; Polymerised Aluminium Chloride; PACl
Primary Purpose	Coagulation and flocculation of fine suspended particles in pool water. Improves water clarity and filtration efficiency.
Typical Usage	Swimming pools; drinking water treatment; wastewater treatment; industrial water clarification

Poly Aluminium Chloride (PAC) – Advanced Pool Coagulant & Clarifier

Product Overview

Poly Aluminium Chloride (PAC) is an advanced, highly efficient inorganic polymer coagulant used extensively in water treatment processes, including swimming pool water clarification. It is a polymerised aluminium salt that appears as a yellow or white powder and dissolves easily in water. PAC is known for its rapid flocculation, strong adsorption, and high performance even in low dosages, making it a preferred alternative to traditional coagulants like alum.

PAC operates on a similar principle to aluminium sulphate but offers several advantages: it works effectively across a wider pH range, produces less pH reduction, generates less sludge, and forms flocs more rapidly. In swimming pools, PAC clarifies water by coagulating fine particles for easier filtration. Its use is particularly recommended in commercial pools and facilities requiring high water clarity standards, including hotels, resorts, and waterparks.

How It Works

PAC works through a process of coagulation and flocculation, which causes fine suspended particles to aggregate into larger masses that can be removed by filtration.

The coagulation process involves:

• Charge neutralisation – PAC provides highly charged cationic species that neutralise the negative surface charges of fine suspended particles
• Coagulation – Destabilised particles bind together into larger masses
• Flocculation – Coagulated particles aggregate into larger, denser flocs
• Filtration – Flocs are trapped on the filter media, removing turbidity from the water

The coagulation mechanism depends on pH. Under acidic conditions, charge neutralisation is the primary mechanism, while under alkaline conditions, sweep coagulation also contributes. PAC is effective across a wide pH range, making it more versatile than traditional coagulants like alum.

Why It Matters

• Water clarity is essential for swimmer confidence and pool aesthetics. PAC provides a highly effective solution for removing fine suspended particles that cause turbidity, including dead algae cells, organic debris, and colloidal matter.
• Filtration efficiency is significantly improved through coagulation. Sand filters are limited in their ability to remove fine particles and pathogens such as Cryptosporidium. Research has demonstrated that coagulation with PAC dramatically improves removal rates from approximately 50% to over 90%.
• Pathogen removal is enhanced through coagulation. PAC helps remove Cryptosporidium oocysts and other chlorine-resistant pathogens that may not be effectively inactivated by chlorine alone.
• Reduced chemical usage is achieved because PAC is effective at low dosages. This reduces the overall chemical load in the pool water and lowers operating costs.
• Less pH impact compared to alum means less pH adjustment is required after treatment, simplifying pool water chemistry management.

Key Benefits

1. Highly Effective Coagulation
   PAC provides superior coagulation performance, effectively removing fine suspended particles that cause turbidity.
2. Wide pH Operating Range
   PAC operates effectively across a broad pH range, making it suitable for various water conditions without requiring extensive pH adjustment.
3. Less pH Reduction Compared to Alum
   PAC produces less pH reduction than traditional aluminium sulphate, reducing the need for pH correction after treatment.
4. Rapid Floc Formation
   PAC forms flocs more quickly than alum, accelerating the clarification process and reducing treatment time.
5. Very Low Sludge Generation
   PAC generates significantly less sludge than traditional coagulants, reducing waste disposal costs and filter cleaning frequency.
6. Effective in Low and High Turbidity Water
   PAC performs effectively in both low-turbidity and high-turbidity water, making it versatile for various pool conditions.
7. Lower Residual Aluminium
   PAC leaves lower residual aluminium in treated water compared to alum, improving water quality and safety.

Problem-Solution Table

Problem	Likely Cause	How PAC Helps	Expected Outcome
Cloudy pool water	Fine suspended particles	Coagulates and removes particles	Crystal-clear water
Poor filtration efficiency	Particles too fine for filter media	Aggregates particles for filtration	Improved filtration performance
Persistent turbidity	Colloidal matter in suspension	Removes colloidal particles	Clear water
Post-algae recovery	Dead algae cells in suspension	Removes suspended algae cells	Complete clarity restoration
Chlorine-resistant pathogens	Cryptosporidium and others	Coagulation enhances removal	Safer swimming water
High sludge generation	Use of traditional coagulants	PAC generates less sludge	Reduced waste disposal

Dosage & Application Guidance

Dosage requirements vary depending on manufacturer specifications, pool volume, contaminant load, water chemistry, bather load, environmental conditions, and treatment objectives. Always follow product label instructions and professional water test results.

Based on industry guidance:

• Continuous dosing (PWTAG recommendation): 0.1 ml/m³ of circulation flow
• Batch treatment: 5–20 mg/L for surface water treatment
• Method: Dose continuously using a peristaltic pump for commercial pools
• Dosing point: As far upstream of the filters as possible, but after the sample point for the chemical controller

Important: PAC should not be diluted with water before dosing as it will form a gel. Different grades of PAC have different aluminium concentrations and basicity levels; select the appropriate grade for your application.

Water Balance Reference Table

The values below represent general swimming pool industry guidance and are not specifications of the product described on this page. Actual operating targets may vary depending on local regulations, pool type, water source, equipment design, and operating objectives.

Parameter	Recommended Range	Notes
pH	7.2–7.6	PAC has less pH impact than alum
Total Alkalinity	80–120 mg/L	Provides pH buffering
Free Chlorine	1.0–3.0 mg/L	Normal chlorine levels before treatment

Step-by-Step Application Guide

Before Treatment:

1. Test pool water for pH and total alkalinity
2. Ensure chlorine levels are normal (1.0–3.0 mg/L)
3. Calculate required dosage based on pool volume and water conditions
4. For powder PAC, prepare solution according to manufacturer instructions
5. Gather required PPE: gloves, safety goggles

During Treatment (Continuous Dosing – Commercial Pools):

1. Set up a peristaltic dosing pump calibrated to deliver the required PAC dose
2. Ensure PAC is dosed as far upstream of the filters as possible
3. Allow at least 10 seconds of contact time before water reaches the filter media
4. Monitor water clarity and adjust dosage as needed

During Treatment (Batch Treatment – Residential Pools): 

1. Pre-dissolve PAC powder in a bucket of pool water
2. With the pump running, broadcast the solution evenly around the pool perimeter
3. Allow 6–12 hours for floc formation and filtration
4. Monitor water clarity

After Treatment:

1. Observe water clarity improvement
2. Backwash filters as needed to remove trapped floc
3. Recheck pH and alkalinity — PAC has less pH impact than alum but still requires monitoring
4. Adjust pH and alkalinity as needed

Troubleshooting:

• Water not clearing: Increase dosage slightly; check pH
• Floc not forming: Check pH; PAC may require pH adjustment
• Filter pressure rising: Backwash filter to remove trapped floc

Usage Guide for Kenya & East Africa Region

• High Turbidity Events
  Kenya’s rainy seasons and dust storms can introduce heavy particulate loads that cause turbidity. PAC is highly effective for removing these particles and restoring water clarity.
• Post-Algae Treatment
  During warm, rainy seasons, algae blooms are common. PAC is excellent for removing dead algae cells after algaecide treatment.
• Commercial Pool Applications
  Hotels, resorts, and waterparks in Kenya benefit from PAC’s superior performance and low sludge generation, reducing maintenance costs and improving water quality.
• Coastal Pools
  Coastal areas experience high humidity and salt spray. PAC’s wide pH operating range makes it suitable for these challenging conditions.
• Water Treatment Applications
  Beyond pools, PAC is widely used in municipal drinking water treatment and industrial wastewater treatment in Kenya and East Africa.

Commercial Applications

• Hotels, Resorts & Safari Lodges
  Commercial pools requiring high water clarity benefit from PAC’s superior coagulation performance and low sludge generation.
• Waterparks
  Waterparks with high bather loads and extensive water surfaces benefit from PAC’s rapid floc formation and effective turbidity removal.
• Municipal Pools
  Public pools must maintain water clarity for regulatory compliance. PAC provides reliable coagulation for consistent water quality.
• Schools & Universities
  Educational facilities with high usage benefit from PAC’s effective particle removal and reduced maintenance requirements.
• Water Treatment Plants
  PAC is widely used in municipal drinking water treatment and industrial water clarification.

Residential Applications

• Private Pools
  Homeowners can use PAC for effective water clarification, particularly after heavy use or during periods of turbidity.
• Holiday Homes
  Properties with intermittent occupancy may return to discover cloudy pools. PAC provides a rapid solution.

Safety & Handling

Storage Conditions

• Store in a cool, dry location away from moisture
• PAC powder is hygroscopic — keep sealed
• Keep away from alkalis and strong oxidisers
• Shelf life: 1–2 years when stored correctly

Personal Protective Equipment (PPE)

• Gloves
• Safety goggles
• Dust mask when handling powder form

Mixing Precautions

• Avoid strong alkalis at high concentrations
• Do not mix with other chemicals in the same container
• Avoid inhalation of dust

Spill Response

• Sweep up dry product
• Rinse spill area with water
• Use appropriate PPE

First Aid

• Inhalation: Move to fresh air
• Skin contact: Wash with soap and water
• Eye contact: Rinse with water for at least 15 minutes
• Ingestion: Rinse mouth; seek medical attention

Important Safety Disclaimer

The safety information contained here is provided for general reference purposes only. Always refer to the official Safety Data Sheet (SDS) and Technical Data Sheet (TDS) provided by the product manufacturer before handling any chemical. Local health, safety, and environmental regulations must be observed at all times. The dosage guidance provided is indicative only — always test pool water and adjust dosages based on actual test results.

Product Comparison

Feature	Poly Aluminium Chloride (PAC)	Aluminium Sulphate (Alum)
Form	Liquid or powder	Granular or lump
pH Impact	Less pH reduction	More pH reduction
Operating pH Range	Wider	Narrower
Floc Formation Speed	Faster	Slower
Sludge Generation	Less	More
Residual Aluminium	Lower	Higher
Best Application	All water treatment	Traditional coagulation

Cross-Selling Recommendations

• Algaecide
  For green pool recovery, use algaecide first to kill algae, then PAC to remove dead algae cells.
• Chlorine 65% (Calcium Hypochlorite)
  Shock treatment before PAC improves oxidation and flocculant effectiveness.
• pH Plus (Sodium Carbonate)
  While PAC has less pH impact than alum, monitoring and adjustment may still be required.
• pH Plus Super (Sodium Bicarbonate)
  Maintain total alkalinity for pH buffering stability.

FAQs- Poly Aluminium Chloride (PAC)

1. What is Poly Aluminium Chloride (PAC) used for in swimming pools?
   PAC is a highly efficient coagulant used to clarify pool water by coagulating fine suspended particles for easier filtration.
2. How does PAC differ from alum?
   PAC works across a wider pH range, produces less pH reduction, generates less sludge, and forms flocs more rapidly than alum.
3. How much PAC should I add to my pool?
   For continuous dosing, PWTAG recommends 0.1 ml/m³ of circulation flow. For batch treatment, typical dosage is 5–20 mg/L. Always test water and follow label instructions.
4. Does PAC affect pH?
   PAC has less pH impact than alum, but it can still affect pH. Monitor pH and adjust as needed.
5. Can I swim after adding PAC?
   PAC is safe for use in swimming pools when dosed correctly. For batch treatment, allow time for floc formation and filtration before swimming.
6. Is PAC suitable for all pool types?
   Yes, PAC is suitable for residential, commercial, and public pools, as well as water treatment applications.
7. How is PAC dosed in commercial pools?
   PAC is typically dosed continuously using a peristaltic pump, injected as far upstream of the filters as possible.

Summary / Conclusion

Poly Aluminium Chloride (PAC) is an advanced, highly efficient inorganic polymer coagulant used for swimming pool water clarification. It coagulates fine suspended particles for easier filtration, improving water clarity and filtration efficiency. PAC offers several advantages over traditional coagulants like alum: wider pH operating range, less pH reduction, faster floc formation, and lower sludge generation. Effective for both residential and commercial pools, PAC is particularly recommended for facilities requiring high water clarity standards. For continuous dosing in commercial pools, use a peristaltic pump to dose PAC at 0.1 ml/m³ of circulation flow. Available in powder and liquid forms.

Need Poly Aluminium Chloride (PAC) for your pool or facility?

Vinsol Kenya is your trusted supplier of swimming pool chemicals and water treatment solutions across Kenya and East Africa. Whether you manage a hotel pool, school facility, waterpark, or residential pool, we have the products and technical expertise to keep your water crystal clear and safe.

Contact us today for bulk orders, commercial supply contracts, or expert technical advice.

• 📞 Call/WhatsApp: +254 715 01 45 10
• 📧 Email: inquiries@vinsol.co.ke | info@vinsol.co.ke
• 📍 Ruiru Branch: Next to Total Petrol Station – Kihunguro, Ruiru
• 📍 Eldoret Branch: Rehema Complex, opposite Japara Ltd., along Oloo Street, Eldoret
• 🕐 Working Hours: Mon – Sat 8:30AM – 5PM

References:

1. Publisher Source: World Health Organization (WHO)
   Article Title: Guidelines for Safe Recreational Water Environments, Vol. 2: Swimming Pools and Similar Environments
   URL: https://www.who.int/publications/i/item/9241546808
   Access Date: August 4, 2026
2. Publisher Source: Centers for Disease Control and Prevention (CDC)
   Article Title: Healthy Swimming: Pool Chemical Safety
   URL: https://www.cdc.gov/healthywater/swimming/
   Access Date: August 4, 2026
3. Publisher Source: Pool Water Treatment Advisory Group (PWTAG)
   Article Title: Polyaluminium Chloride (PAC) Dosing (TN24)
   URL: https://www.pwtag.org/polyaluminium-chloride-pac-dosing-february-2014/
   Access Date: August 4, 2026
4. Publisher Source: REUCHER AFRICA KENYA LIMITED
   Article Title: Poly Aluminium Chloride (PAC) – Product Page
   URL: https://reucherafricakenyaltd.co.ke/product/poly-aluminium-chloride-pac/
   Access Date: August 4, 2026
5. Publisher Source: NSF International
   Article Title: NSF/ANSI Standard 50: Equipment for Swimming Pools, Spas, Hot Tubs and Other Recreational Water Facilities
   URL: https://blog.ansi.org/ansi/nsf-ansi-50-2025-equipment-swimming-pools/
   Access Date: August 4, 2026
6. Publisher Source: American Chemical Society (ACS)
   Article Title: The Chemistry of Swimming Pool Maintenance
   URL: https://pubs.acs.org/doi/10.1021/ed084p1124
   Access Date: August 4, 2026
7. Publisher Source: PubChem (National Library of Medicine)
   Article Title: Polyaluminium Chloride – Compound Summary
   URL: https://pubchem.ncbi.nlm.nih.gov/
   Access Date: August 4, 2026