Buster29, there are a lot of ways to find out if your water is hard or not. There may be some home testing kits at a local hardware or home improvement store. A professional plumber could tell you right away if your water is too hard, but be prepared to pay a fee for his service call. If your home already had a water softener unit installed, it's fair to assume the previous owner already has some information you might need. It may be that your current water softening unit is in need of maintenance or it needs to be replaced with a newer, more efficient model.