How Much Chlorine Is Really in Your Tap Water? Most people have no idea how much chlorine is actually in their tap water. Using a simple test tablet, we compare untreated tap water to filtered water—and the difference is shocking. Chlorine isn’t just something you drink; it’s what you shower in, cook with, and absorb through your skin every single day. Seeing the color change in real time makes it impossible to ignore how much exposure adds up over time. Seeing is believing. Type “book” below to