A: We provide absolutely free stock samples less than 1KG, if you want special samples, be sure to Speak to us and we could communicate. Poly Aluminium Chloride achieves this by creating hydroxyl ions and polyvalent anionic polymers, which aid the coagulation and flocculation of suspended particles to boost drinking https://www.pac-pfs.com/product/drinking-grade-polyaluminium-chloride.html