You don't need a filter in Europe to make the water safer to drink because the tap water quality is tightly regulated and controlled, and tap-water is considere

You don't need a filter in Europe to make the water safer to drink because the tap water quality is tightly regulated and controlled, and tap-water is considered safe to drink. I can't speak about countries outside of Europe because I don't know their regulations. That's why I said Europe. Edit: After a bit more research I see that Western European tap water is mostly safe. Flavour is something else of course. If a filter helps than that is great. Healthier than mixing it with lemonade or coffee.