Most salt water “water softeners” use potassium chloride. Your water system flows water through the potassium chloride and leaves as “salted water”. So, yes, it does make salt water...not sodium chloride, but potassium chloride. Read about it...it is incredibly unhealthy to consume. Better, filter the system (even a whole home unit) with an ultra high efficiency carbon filter, or even better a reverse osmosis system. To filter salts and minerals from your water, consider an electro chemical system (NaturalSof) is very cool.
https://naturalsof.com/. I run a whole home filtration system through my entire house, and behind that run a NaturalSof unit. No lime, no scale, very clean water from every faucet. Works incredibly well.