Duly noted. Try to fabricate an all-plastic passive-solar still, then, if you can. And when you get enough water, do a GOOD flush of your pots. Actually, I'd flush them through real well just with your tap water dropped down to pH 6.3, just to remove any buildup you have already, and then a light feeding with your nute solution. If you have a micro supplement, you can mix that up weak and, again, LIGHTLY, do a foliar feed to try to combat the micro lockout you are seeing.

Edit: changed thread title to get other input on situation and clarify what it is