A: We provide free inventory samples under 1KG, if you want Exclusive 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 enhance drinking water excellent. Coagulation: https://www.pac-pfs.com/product/drinking-grade-polyaluminium-chloride.html