I recently discovered that running a water softener resin cleaner greatly improved the efficiency of my onboard water softener in the truck. I plan to use this product periodically to keep the softener running in tip top shape.
Just recharge them every 25-50 hrs depending on your water hardness. A bag of salt is like $5 and will be good for a few charges. I usually run it for an hour. I have 3 softeners, one over 15 years old and they do their job if you charge them.