Theory has it, that on a dry fast you’re not losing electrolytes because you’re just not washing them away like on a water fast, and I tend to agree.
Consider what happened to Shane Warne. He went on a 14 day juice cleanse (you’re only supposed to do 3). He had no idea he had to replenish potassium, so 14 days he’s washing out the electrolytes on this liquid diet, one day he just drops dead, because potassium regulates heart rhythm, and any liquid diet rips them out of you,
Now a dry faster goes twenty days, without so much as skipping a beat, why? He didn’t wash out his electrolytes, they simply didn’t go anywhere, they remained in his body as the system self hydrated with metabolic water, cleverly sparing electrolytes.