Every Filter is Cool!Est. 1991, WQA membership since 2016, SF is a famous water filter brand in China. Now focusing on water cartridge manufacturing and developing, first product got NSF certification in 2015. Visit our website: www.sffiter.com.cn to know more about sediment filter cartridge, activated carbon filter cartridges, countertop filter and bottle filter.Our head office located in Suning, Hebei, and we have branch companies in Guangzhou and Shanghai ( Kunshan).We have ISO9001 Certification and can provide Rohs/FDA/CoC/ICQ test reports for all our products.We sincerely welcome all customers for mutual development.