Water softener help please?

Have had problems with our Water Boss since we had a 5 day power outage. We cleaned part of the head and it does seem better. Had the water tested after cleaning the resin tank, and it tested 6 gr. hardness, no iron. Straight from the well, it tests 12 grains of hardness, plus iron. What is the usual testing reading when going through a softener? Should it be zero? Or do you think the whole head needs to be serviced. We had a sticking piston in the brine housing. Anyone familiar with a Water Boss, would appreciate an answer to my question.