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

What is it for? According to the product description : "Enjoy fresh shower water straight from your tap and protect the environment by avoiding plastic bottles" I have never used a single plastic bottle for my shower. Who showers with Henniez or Aproz? Why does the description start with "shower" and end with "food"?

In most other places this would be silly but in Switzerland this is simply ridiculous 😂 😂

when i shower with this thing do i still need shower gel ? then the water will be so pure that the dirt on my skin will get scared and leave automatically? will I also become more beautiful and my skin younger when I shower with this thing? why is this thing so cheap i need something expensive 😂 ?

What is liquid wood supposed to be? Pyrolysis oil or tar?

Why is this needed? I don't understand the product. Grander still has energy in it, and here?

It's a kind of water softener, right? In other words, when I shower with this water, I never have to clean the glass shower wall again, because the water only rolls off and doesn't leave any limescale stains? It's a serious question, because I'm mainly concerned about cleaning the shower because of the limescale deposits.

Is lime also filtered?

Does the filter reduce water pressure? how is the flow rate?