YUNDA FILTER has 12 patents for water filter cartridges.     

YUNDA FILTER has got the authoritative NSF 53,NSF 42 and NSF 372 Certifications from WQA. Please click the following link:

NSF372:   http://www.wqa.org/Find-Products/ctl/Detail/mid/1054/cid/TIANJIN_JINGHAI_YUND/sid/1/keyword/Tianjin

NSF42:     http://www.wqa.org/Find-Products/ctl/Detail/mid/1054/cid/TIANJIN_JINGHAI_YUND/sid/29/keyword/Tianjin

Or  get on the web of WQA http://www.wqa.org, Search our company name TIANJIN JINGHAI YUNDA INDUSTRY AND TRADE CO., LTD

YUNDA FILTER has got NSF42, NSF372 Certifications from NSF and IAPMO. 

We are the sole manufacturer who have got all the three authoritative certifications of  NSF, WQA and IAPMO.