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.
I switched from the green bags of rust remover to a 1/4 cup of this mixture and it works better than the green bag and costs a lot less in the overall price. very easy just add 40-pound bags of salt to the salt storage bin and sprinkle 1/4 cup of Rust Out on the top layer of the salt you just dumped in. Layer it 40 pounds at a time with 1/4 cup of Rust out sprinkled per bag. It works great!