Response to Water marks....FOREVER.

Water marks are caused by dissolved minerals in your water supply, usually calcium. You can install an extensive water treatment system on you water intake; or, you can do as others have suggested, give your film and prints a final rinse with distilled water (distilled water is a misnomer; it should be called mineral free water). I save the condensate water from my dehumidifier. It is, for the most part, mineral free.

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