I had my Water softener serviced the other day, and I told them the water had an odor. (like oil). They tested the water, and said all was fine. They said the smell was from the Hot Water Tank's Anode rod. They also said the rod can be removed and left out, as it serves to prevent problems from hard water not soft water.
Any ideas?
My HW tank (gas), is just a year old, and the other tank (electric), never had this problem. I have had the water softener 5 years.