You need to do a little research in order to help you choose a water softener. If you are thinking about a water softener, you already know you have a water problem. But you need to know exactly what your water problems are. You also should know what water softeners can and cannot do.
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You can test your water, or have it tested. The internet is a good source of information on home water testing. Perhaps ideally, the tests can be done by a qualified water treatment system professional. A number of minerals are common in hard water, including calcium, magnesium, and iron. You need to know what is in your water, and how much of it. Your local water treatment system specialist will be able to help you with those tests. They can then recommend and install a system that will meet your water treatment requirements.