A: We offer absolutely free stock samples less than 1KG, if you want Unique samples, please Get in touch with us and we could connect. Poly Aluminium Chloride achieves this by creating hydroxyl ions and polyvalent anionic polymers, which aid the coagulation and flocculation of suspended particles to boost h2o https://www.pac-pfs.com/product/drinking-grade-polyaluminium-chloride.html