I've been using deionized water in my darkroom for decades. In the
far corner of the sink are two filters. The right (dark) filter is
the resin deionizer. It provides roughly 100 gallons per resin
charge. A resin charge costs $40. Water is double filtered before
entering the deionizer.
http://www.visualimpressions.com/DarkroomSink.jpg
http://www.coleparmer.com/catalog/vcatalog_page.asp?p=2216
Bottom of the page on the right (clear housing).
http://www.waterwise.com/products/products.asp
WaterWise often has great sales, up to $100 off the price of distillers.
Jim
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