Bring it to a friend’s house and test their water. They’ll either be horrified or fascinated—either way, it’s conversation fodder. One friend of mine discovered her tap water was 340 ppm. She bought a Zero Water system that same afternoon.
Use it to settle dinner table debates. “Is bottled water really better?” your uncle will ask. Pour a glass of generic store brand and a glass of your filtered tap. Show him the numbers. Science wins again.