It is important to regularly sanitize your softener resin with a disinfectant. It is used when changing the filter cartridge sediments, every 6 months or 1 year maximum, or after a long period without operation. It is designed to attack and oxide deposits that do not go during regeneration.
Use resin cleaner is very simple, just pour a dose into the fireplace regulator brine (vertical tube tray salt). By mixing the brine, the product is from the beginning of the regeneration of the injection.
If you want faster action, you can cause yourself regeneration (see manual of your softener).