After a long lapse, I'm going to try film developing again, but where I live now I have a private well with High mineral content water, not merely hard water. The 450' deep well goes down into the Burlington Limestone which has so much iron that gravel from it rusts to a golden brown. There is a lot of lime, obviously, and I can taste some sulfur, which might alternately come from the several seams of Illinois coal the well shaft goes through on the way down to the limestone. I don't plan to use my tap water to mix with any photo chemicals. Distilled water is pretty cheap at the supermarket. My main concern is with the final washing step. the bulk of which I would have to use tap water for. So far, my thinking is to use a distilled water rinse after the fixer, then run filtered tap water through the film tank for recommended minutes, then use a final rinse with distilled water with Photoflo. Obviously, filtering will get rid of sediment in the tap water, but my main concern is the dissolved chemicals. I want to keep them from reacting with remnants of the fixer (hence first rinse) and also keep them from causing water spots (hence the final rinse), but will the tens of minutes of washing with this water leave traces in the emulsion that will harm the negatives? I searched for past threads related to this. These two have some overlap: http://www.photo.net/black-and-white-photo-film-processing-forum/006Xwf?start=10 http://www.photo.net/black-and-white-photo-film-processing-forum/00XTwX But I'm not sure they address water quite like mine or my main question. Folks experienced with coping with well water issues, do you have any clearer advice, cautions, comfort, horror stories, schemes, tricks, etc? Or does my plan, as described, seem like it will prevent most problems or serious problems?