I have a Soft Cell and a RV pro 10000 softner and I usually flush it out and then sanitize it with a diluted clorox and water solution similar to what is used to sanitize your water tank in the RV.
I then regenerate it, and its usually good for at least 3 weeks unless I hit some really hard water. The RV Pro 10000 doesn't have the same capacity as the Soft Cell and needs regeneration sooner.