Home was just sold only realtor on site. Check water treatment system. System has sat idled for almost 2 years. Strong sulfur smell. I was able to regenerate 1 of the 2 units. Softener unit would not manually regenerate. Likely bad computer board. However due to the time that the units have sat idled believe the media in units have solidified. Water pressure is quite low due to this. Recommend replacing units with new units Estimates are Dual stand up filters with head units $6800-7400 Single stand up filter with head unit $4750.