I have a Rainsoft water softener that uses potassium pellets. Several months ago it stopped working b/c the potassium solidified at the bottom of the unit, with water on top of it. I tried to break it up manually but that proved too diffficult. Is there a way to dissolve it?
Breaking it up with a ground pin or other type steel bar (don't poke a hole in the bottom of the tank or the salt gird if you have one [that's a false bottom in the salt tank]) is usually the quickest way to clean the tank out but, MANY gallons of hot water over a number of hours, will dissolve it but, it also will make the tank weak because it is plastic.
I second the hot water but pottasium sets up like a rock. The best way to not have that problem ever again is to fill up the brine tank and let it go almost completely empty before putting anymore in. get rid of the old before you put in the new.