A: We offer cost-free stock samples less than 1KG, if you want Particular samples, please Call us and we could converse. Poly Aluminium Chloride achieves this by generating hydroxyl ions and polyvalent anionic polymers, which facilitate the coagulation and flocculation of suspended particles to enhance drinking water good quality. Coagulation: https://www.pac-pfs.com/product/drinking-grade-polyaluminium-chloride.html