Elvan filter and Elvan water filter are our unique technology in the world and we adopted DMMFDouble Motor Multi Filters system of which is patented.

• 淡英斑岩过滤器和淡英斑岩滤水器是我公司世界独创技术，我们采用DMMF（双发动机多重过滤器）系统,该系统已获专利。