Oh yes. But all I do is add salt. Not sure about the neutralizer... In fact it's never been serviced in three years. Been wondering about that, so I'm gonna bust out the owner's manual.
The system we have now was replaced before we moved in and we didn't know it needed to be serviced regularly which is now causing us problems with our pipes. The Ph level is so acidic that its actually eating away the copper from the inside and 3 times this year we had leaks spring up, twice inside of walls. it was a MESS, both to cleanup and to fix.
I would call a local water treatment guy and just have him come over and take a look at your system, its well worth the small fee not to go through what we did with leaking pipes and repair bills.