A: We offer totally free stock samples a lot less than 1KG, if you need special samples, you should Make contact with 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 https://www.pac-pfs.com/product/drinking-grade-polyaluminium-chloride.html