Question about Riva Shower filter rivaALVA SKIN&HAIR - metal housing with filter cartridge

Grander is fake, there are countless tests on it. A bit like homeopathy. Here, at least, it is an activated carbon filter. It filters out the usual stuff that activated carbon filters do. Google.

If I understand it correctly, the filter can transform normal water into snake oil. Sounds like an insanely good deal.