A: We provide free stock samples under 1KG, if you want special samples, please Speak to us and we could connect. Poly Aluminium Chloride achieves this by building hydroxyl ions and polyvalent anionic polymers, which aid the coagulation and flocculation of suspended particles to further improve h2o good quality. Coagulation: https://ledbookmark.com/story6593725/detailed-notes-on-aierfuke-manufactures