Natural Toilet Bowl Cleaner - This natural cleaner promises to remove mineral deposits, rust, and hard water stains as effectively as the regular cleaners you have used for years.
If so, what would hard water do to a person?
In the course of time it was noticed that certain materials, such as charcoal, had the power to some extent also of softening hard water and of removing organic matter, and at the beginning of the 19th century charcoal, both animal and vegetable, came into use for filtering purposes.
In hard water areas, you could add a tablespoonful of vinegar which I am reliably told helps keep fabrics soft.
Also eventually, hard water can corrode metal, including your water pipes.