Meisheng holds certification of ISO-9001:2000, CE, cUPC , WRAS and ACS. We guarantee each product manufactured to the highest standards in the industry with the finest craftsmanship. cUPC certified Meisheng to the ANSI/NSF 61-9 for Drinking Water Systems. In a word, the certification certified that Meisheng's products are both safe for use within any drinking water system and adhere to the mechanical quality standards for ease of installation, operation, and reliability.