Q: My old toilet has black stains where you see water ... which originate in living organisms, and mineral deposits, which ...

black streaks down the toilet bowl could possibly be manganese mineral deposits. It can be removed with an oxidizing solution like chlorine, but pure chlorine isn't considered safe to use in ...

Over time, these build up and can form a crust in your toilet, sink or bath. Sometimes, in the toilet the stains are just below the water line, but they can also appear around the rim. And ...