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Thread: chemical content of European swimming pool products

  1. Back To Top    #1

    Join Date
    Jun 2009
    Location
    Almelo, The netherlands
    Posts
    2

    chemical content of European swimming pool products

    Hi

    I found this page, looking for the CYA content of the chlorine tabs I bought in France:

    http://ile-de-france.sante.gouv.fr/s...on/prodpis.htm

    Trouble is, I don't fully understand the numbers.

    NOM DATE SOCIETE CL2 PRODUIT AGR
    CARREFOUR CHLORE PASTILLES 50/20 02/11/94 ELF - ATOCHEM 50 ACIDE TRICHLORO-ISOCYANURIQUE 1934
    So Cl2 = 50 and trichloroisocyanuric acid (C3Cl3N3O3) =1934, but what? milligram? The tablets weigh 20 gram each, so they are 99% something else? That can't be true.

    It probably is a relative number, independent of tablet weight. Also, the chlorine content varies with the same AGR (?) value. The Wikipedia entry of trichloroisocyanuric acid is probably written by a pool-chemicals salesman:

    Benefits of TCCA in Swimming Pool- [sic]
    * Available with 90% chlorine concentration
    * Due to high chlorine content, handling is easy for large pools.
    http://en.wikipedia.org/wiki/Trichloroisocyanuric_acid

    Can somebody explain to me how the chlorine concentration can vary in a pure substance with a known formula?

    Or is this just more obfuscation from pool-chemical sellers?


    I'm so happy I found TFP. I was wading through all kinds of stuff and outraged by the prices. Solid info was nowhere to be found. I'm still attending Pool School.
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  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: chemical content of European swimming pool products

    Not knowing french, it is a little bit difficult to be sure, but those appear to be 55% trichlor and 45% filler. Pure trichlor has 90% available chlorine, but these have only 50% available chlorine, so they are 55% trichlor and the rest is inert.

    The way things like % available chlorine is calculated is weird, it is easy for the percentages to add up to more than 100%. If you really want to know, read here, but I don't recommend trying to understand it.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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