The assumption is often made that, when you’re showering, you’re doing so in water that is free of contaminants and bacteria. But that truly is an assumption. As water passes through the pipes in your home and through your showerhead, it builds up biofilm (a fancy word for gunk) that holds bacteria. These bacteria may be toxic. They may be of no consequence. It really depends on the filth that’s been making a home in your showerhead and the pipes behind your walls. Read on to learn more, and then consider whether it’s time to buy a new showerhead.