Everyone Was Wrong About Reverse Osmosis–Until Now
Trashcan-sized RO filters that you can install at home always felt like magic, yet I strongly feel they should be a commodity in the developed world, something you'd expect out of wherever you live, just like stable AC power. A friend used to be a salesman for those; they'd bring an electrolysis device to a presentation at your home, and show what kind of stuff was floating in your tap water. It made for a cool show but also did help spread awareness of just how bad the water was.