I think you may be right Clay. My water is very hard and the water from my faucets in my darkroom is softened. But, at any rate, the lowering of the temp eliminated the crystals completely. Sometimes I want to step back and ask the question if there is sorcery or the like involved in this process???!!!! Things go along so smooth and all of a sudden out of nowhere here come the problems. Anyhow, as a young man, my father used to tell me when I would have frustrations helping him on his carpentry jobs..."If it was easy, anybody could do it." I am reciting this now!