A softener is fine for your non-brewing uses, but don't use softened water for brewing. Many activities in the home can benefit from a softener, but I find that just plumbing a softener to the hot water heater is sufficient to gain most of the benefits with fewer detriments. This way, the dishwasher, clothes washer, and showers are hooked up. The cold water will still be hard, but that is preferred for human consumption.