Well, I've bought the Aquamarin RO 5 or NW-RO50-NP35. Only 2 names of apparently a dozen.
But it came with a plastic tank NPTK-3G. No CE-certificate or anything that says food grade. I searched the net and these plastic tanks are produced in China. I'm skeptical. Not that I wouldn't trust Chinese products, but I don't want to clean the water only to get Bisphenol-A or even worse, PKA in my water. And without any certification, it's not very convincing.