We just bought a new house, which has a salt-based water softener (picture below). The sellers hadn't been living in the house since last December (2022) while they were having it remodeled, so they turned off the softener and bypassed it via valves. Altogether, it has been bypassed/off for 11 months.
After we bought the house, the seller told us that, to use the softener, we simply need to un-bypass the softener and run the regeneration cycle to "flush" it through.
Is that actually all that needs to be done? Is there any issue with it having sat unused for such a long time?