-Water softeners are used to eliminate most of the minerals and slats found in hard water.
-Watkins factor is an old system of development control, based on observation of the processing image under safe lights.
Clean water is a must. Filtration is not particularly necessary, if the water supply is potable. Minerals are more of a problem, but using a good wetting agent mixed with distilled water will usually solve spotting from hard water.
This is a solution of a non-ionic wetting agent in water which helps uniform drying and eliminates drying marks from hard water.
Film is then dried in a dust-free environment, and finally cut (if roll film) and put into protective sleeves.
 See also: Hard, Light, Film, Wetting agent, Print
  
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