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  1. #1
    Anscojohn's Avatar
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    What about Calgon?

    The thread about Arm and Hammer Washing Soda caused me to ask the experts. Can super market Calgon be used in hard water, or is some kind of special chemical needed? Thanks in advance.
    John, Mount Vernon, Virginia USA

  2. #2
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    Calgon changed their formula about 20+ years ago. It is no longer suitable for use in photographic solutions as a sequestering agent. Kodak uses a product called Quadrofos. I've used EDTA and the Dequest series of chemicals with great success.

    PE

  3. #3

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    You can pick up EDTA at Artcraft.
    http://www.artcraftchemicals.com/products_1.php

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    Disodium EDTA is probably best to use.

    PE

  5. #5
    Anscojohn's Avatar
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    Thanks, fellas.
    John, Mount Vernon, Virginia USA

  6. #6

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    The stuff I use is sodium hexametaphosphate, although you could also try sodium tripolyphosphate.



 

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