Hard water? You're in luck.

Several times a year, I receive requests from people to do something about their hard water. The softener companies have done a good job at making hard water a real bad thing in people's minds, unfortunately. Check out the quote below from EPA, and you'll see why this perception is unfortunate. This is not a lone or maverick report. There have been dozens of studies looking at hard water and cardiac health over the years, and they all say the same thing- hard water is good for your heart. don't let anyone tell you different.

"Lower cardiovascular death rates were found in populations where the water supply contained relatively high levels of water hardness or calcium and magnesium compared to populations in areas with low levels. This protective effect was found for populations throughout the world, especially when country-wide studies were conducted."

Calcium and Magnesium may be annoying in pipes, boilers, and water heaters, but they are essential for the human body. Be careful about taking them out of your water and replacing with Sodium, which is what happens when you use a softener that uses rock salt to regenerate.

source- 
http://www.who.int/water_sanitation_health/dwq/nutrientschap10.pdf
WATER HARDNESS AND CARDIOVASCULAR DISEASE:
A REVIEW OF THE EPIDEMIOLOGICAL STUDIES, 1957-78 
Rebecca L. Calderon 
U.S. Environmental Protection Agency 
National Health and Environmental Effects Research Laboratory 
Research Triangle Park, NC, USA