You have been very busy
Clean the salt tank out as best you can. Add one bag of Red Out, and then two bags of the regular pellets.
Put the softener into manual regeneration.
If it is working properly it will automatically put a measured amount of water into the brine tank.
Confirm that the system added water, wait at least two hours, now put it into regeneration again.
This regeneration will draw a fresh brine solution and you will once again have soft water.
I replied to your email and the pictures you sent me.
We still have some work to do ...