I have a Kinetico water softener, Model #60, since 1988. I have had no problems since I bought it. In the past weeks, the water has been tasting salty, too salty to drink and use. The drain line is clean. There is a mention that the head on the resin tanks could not be working correctly.

Can someone tell me what they think the problem can be? Can the head be changed out on the resin tanks and if so, what would the exact name of the part and part number be?