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Thread: Free Chlorine

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    rboutwell's Avatar
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    Free Chlorine

    I'm confused about the appropriate level of FC for an IG plaster pool. I've seen 3-5ppm, 7-10 ppm? What's the consensus?
    Ray Boutwell, Wichita Falls, TX
    8,500 gallon IG, pebble pool, 425 gallon IG spa (no heater yet)
    Hayward Variable speed pump (2)
    sand filter for pool, cartridge filter for spa
    Taylor 2006c

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    Mod Squad jblizzle's Avatar
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    Re: Free Chlorine

    The scientific studies from the 1970s show that the effectiveness of the FC is tied to the the stabilizer (CYA) level and that is why we recommend and have the FC/CYA Chart.

    No idea why the pool industry still does not seem to acknowledge this relationship 40 years later.

    So the bottom line is a FC of 3-5 or 7-10 may be appropriate, depending on the CYA level. This is really the thing that sets the TFPC method apart from the typical pool store spiel.
    Jason, TFP Moderator
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    Texas Splash's Avatar
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    Re: Free Chlorine

    Ray, it all depends on your current CYA, and if you use a salt water generator (SWG). If you refer to the Chlorine/CYA Chart (link in my sig), you'll see how the FC lines-up with a current CYA. That's how they are balanced together. Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    rboutwell's Avatar
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    Re: Free Chlorine

    Makes sense. Thank you!
    Ray Boutwell, Wichita Falls, TX
    8,500 gallon IG, pebble pool, 425 gallon IG spa (no heater yet)
    Hayward Variable speed pump (2)
    sand filter for pool, cartridge filter for spa
    Taylor 2006c

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