What are the advantages of the shell of the water-based high-oxygen living water machine, which is metal or plastic, plus the water purification technology adopted by Japan and the United States?

I don't need to say more! It doesn't matter whether the shell is metal or plastic, it may be mostly a marketing gimmick. After all, plastic filter elements are still popular in the world. As for the advantages of the water main high oxygen energy living water machine, you should take the price into account first. Japanese and American families have a high penetration rate of water purifiers, and the production technology is advanced and mature, but it is often not acceptable to ordinary consumers, and there are also many brands in China, especially some established home appliance giants are now involved in the water purifier industry. Therefore,