We have a "salt" based water softener, and I have actually tested the water in the house, and have NEVER had any reading of salt in the water. Please do some research, standard water softeners use the salt to clean the resin filter, and then the cycle cleans the resin filter of any salt reside, the result is salt free softened water. I have used salt based water softeners (all Sears units) for over 45 years, and have never had any concerns about salt in the water.
Feel free to send me a PM if you would like to discuss further.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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