I only drink distilled water, or rainwater, and only pure grain alcohol.
While minerals in water may have an adverse effect on the film development process your body needs them. A little calcium is good for your bones. Try spring water.
Originally Posted by Gerald C Koch
From a similar thread not so long ago some people in Europe pay exorbitant prices for distilled water if it is availale at all. .
Why is this? In some European countries it's a pain in the @$$ to get distilled water and in the US it is sold all over the place by the gallon (milk and petrol are sold by the gallon as well). I use distilled water at various points in the processing workflow. What is everyone else using it for?!
The temporary hardness in ground water comes from the presence of soluble calcium bicarbonate. When the water is boiled briefly this compound decomposes to form calcium carbonate which is insoluble. All cacium salts are effectively removed from the water. Calcium in water used in photographic solutions can causes problems with high sulfite containing developers like D-76 where it precipitates out as calcium sulfite and in carbinate containing developers like D-72.
Magnesium compounds are soluble and only affect water when soaps are used for washing. Both calcium and magnesium form insoluble soaps which stick to cloth fibers. Magesium salts in water are not a concern in photography.