A: We provide totally free stock samples below 1KG, if you need Unique samples, make sure you contact us and we could communicate. Poly Aluminium Chloride achieves this by producing hydroxyl ions and polyvalent anionic polymers, which facilitate the coagulation and flocculation of suspended particles to further improve water excellent. https://www.pac-pfs.com/product/drinking-grade-polyaluminium-chloride.html