This water softener has been unused for perhaps a year. Its full of salt, but there is a good amount of water in it (it may have been interrupted in the middle of a cycle) and it is a nasty brown color. Some of the salt above the water is developing a brown tint as well. AFAIK not much grows in a saturated salt solution, but the brown color is puzzling. What steps should be taken to clean or disinfect it before using again?