Answer from AI Chat GPT: 

⭐ 3. Major Certified Manufacturers (Proven Validated Sources)

These companies produce potable water–grade PAC and PAC-SS , certified under NSF 60 or EN 883 .

✔ Kemira

• Global leader in water-treatment coagulants

• Products: Kemira PAX / PAX-XL modified PAC (includes silicate variants)
  🔗 https://www.kemira.com

✔ Feralco

• European manufacturer specializing in potable water coagulants

• Products include Sodium Aluminates, PAC, and PAC-blends with silicates and sulfates
  🔗 https://www.feralco.com

✔ Aditya Birla Chemicals

• Produces certified PAC and enhanced PAC formulas
  🔗 https://www.adityabirlachemicals.com

✔ Gulbrandsen Chemicals

• High-purity PAC variants for drinking water
  🔗 https://www.gulbrandsen.com

✔ USALCO

• Major North American producer of aluminum-based coagulants

• NSF/ANSI 60 certified plant network
  🔗 https://www.usalco.com

✔ Accepta / International Water Treatment Companies

• Providers of PAC-SS formulations for municipal water treatment
  🔗 https://www.accepta.com