By Dan Gould, Networx
What exactly is hard water? Though it sounds scary, it's not generally harmful to humans. All "hard water" means is that is has a high mineral content.
While it may not be dangerous to people, hard water can be harmful to plumbing hardware. Mineral build up can compromise the functioning in both domestic and industrial settings.
To dissolve mineral deposits from a clogged shower head, simply soak it for eight hours in a 50-50 mix of vinegar and water. After rinsing it off, it should be good to go.