Hello ruston
I had also salt crystalisation problems. Solution temperature i think is not the problem, to verify this place a cup of epsom solution at room temperature and it will not crystalise. I have also heat the water filtration tubes with no improvement.
I problem is that many pumps have metal parts inside the impeler, usualy the saft.I use to valves (in and out) and a third valve to purge the water lines. What type of tank you have,is it well insulated?
Thanks
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