I read an article the other day and it said three out of four homes in the United States has some type of issue with hard water. I bet if you asked people if they have hard water then most of them would say no because they are unaware they have hard water. This should concern people because hard water can cause a lot of problems other than your water not getting soapy enough.
I have a friend who had to replace two dishwashers long before either one of them should have worn out. It wasn't until his water pressure got really low in his kitchen that he called a plumber and found out that the hard water was leaving deposits and closing off the pipes.
The plumber also told him that the hard water was probably the reason he was having a tough time keeping his dishwashers running properly. When you have really hard water you need to find a way to filter it before it reaches your appliances and does serious damage.