A: We provide free inventory samples below 1KG, if you need special samples, be sure to Speak to us and we could talk. Poly Aluminium Chloride achieves this by building hydroxyl ions and polyvalent anionic polymers, which facilitate the coagulation and flocculation of suspended particles to enhance h2o quality. Coagulation: https://www.pac-pfs.com/product/drinking-grade-polyaluminium-chloride.html