Is anyone using rainwater to supply a darkroom? I've got a great outbuilding that would be fine for a darkroom, but water isn't part of the picture. It's a detached garage with half finished as office space. It would be easy to run gutters off the roof and collect in a 200Gal industrial potable tank (lots available via surplus suppliers), then plumb the supply from there. Filtering the water would be a must, but does anyone have direct experience collecting water for darkroom use? Has it worked out for you?