I recently set up a new darkroom and I've been having trouble with a filmy coating and fingerprints (my own) on dried prints. The prints are being dried face down on a fiberglass screen hammock. The water is filtered well water (Calumet filters-hot and cold). All other processes and chemistry are unchanged from previous darkrooms. Any idea what could be causing the trouble? If I have my water tested, what should I be looking for? Thanks for any help you can offer!!