A: We offer free of charge inventory samples below 1KG, if you need Specific samples, please Speak to us and we could communicate. Poly Aluminium Chloride achieves this by building hydroxyl ions and polyvalent anionic polymers, which facilitate the coagulation and flocculation of suspended particles to further improve drinking water https://listbell.com/story10747190/the-2-minute-rule-for-high-purity-polyaluminium-chloride