The excess mineral in hard water stains sinks and toilets and interferes with the action of soaps. Excessively hard water (greater than 350 ppm) may be harmful to human health.
These resources are brought to you by the Cooperative Extension System and your Local Institution
Welcome
eXtension is an interactive learning environment delivering the best, most researched knowledge from the smartest land-grant university minds across America.
Have a question? Try asking one of our Experts
Have a specific question? Try asking one of our Experts
Unlike most other resources on the web, we have experts from Universities around the country ready to answer your questions.