All this talk of SALT in SOFTENED WATER is rubbish SALT is not added to the water supply with softners it is used for Cleaning & Regeneration of the R esin which softens the water. The salt tank has water added to produce a Br ine which is pushed through the resin tank to clean it and then pumped out followed by flushing with Clean water to remove any remaining salt! during this process the house supply is shut off ( Bypassed ) and reopened after s o NO SALT enters the house supply. If you have Salt ? Salt Taste in your so ftned / drinking water your System is FAULTY and needs checking.
BY THE WAY.. I still Have A Halsted Trio Combi Boiler running on Softned Wa ter which is 22 years old and still running without ever needing a heat exc hanger! Only part ever needed in that time is the 3 way valve changed twice . I bet a new Condensing Combi will not go that long!!