A: We offer free of charge inventory samples below 1KG, if you need Specific samples, please Get hold of us and we could communicate. Poly Aluminium Chloride achieves this by creating hydroxyl ions and polyvalent anionic polymers, which aid the coagulation and flocculation of suspended particles to further improve water https://www.pac-pfs.com/product/drinking-grade-polyaluminium-chloride.html