Eventually a R/O is on the list but way out of budget right now. I wish we could trasport water but we are deep rural, and my grow is to large to supply that way.

It's rainy here so we plan to make use of that.

I would like to know more about distilling water, but I also wonder...
Could I use the reaction to my advantage by adding just enough sulfur to the water to remove the Ca then run the water through a filter to remove the precipitate. Does anyone know of any good literature about this.

Also what can I try to do in the mean time? I'm watering someone every day. Is it better to continue to feed my plants, or should I leave them on strait water 'til I find a solution.
FYI Even my young plants that aren't fed yet show signs of the white gypsum on the soil surface when it dries, so there must be trace amounts of sulfur in my water too.

Sorry to be so hasty but I have so much to read...