YUNDA FILTER has 12 patents for water filter cartridges.     

YUNDA FILTER has got the authoritive NSF 53,N S F 4 2 and N S F 3 7 2 Certifications from W Q A. 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 N S F and I A P M O. 

We are the sole manufacturer who have got all the three authorative certifications of  N S F, W Q A and I A P M O.