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Thread: Raging Chlorine!

  1. Back To Top    #1
    matj6876's Avatar
    Join Date
    Jul 2007
    DFW, TX

    Raging Chlorine!


    As a result of reading chemgeek's FC/CYA sticky I feel that I have to raise my FC from the usual 2ppm up into the 5-7 range.

    Reading that people had issues maintaining higher levels of chlorine especially in sunnier climates (I'm in North Texas) I jacked up my SWCG fairly high thinking it would take a while to get there. As it turns out that little thing is really quite efficient. I jumped from 2.0 to 12, which held overnight, in two days

    I have a CYA level of 40, rising hopefully to about 70 over the next week as the stuff dissolves and I have clicked my SWCG back down to non-testosterone driven levels! The ortho test maxes out at 5, this morning it even went a little red before turning very, very yellow. My question is this...

    If you follow the advice of the charts and run an FC above 5 and you are meant to test daily are you performing the FAS/DPD test every day?

    My numbers FYI:
    Temp: 77F
    FC 12 (and raging!)
    CC 0
    TC 12
    TA 120 (and falling slowly)
    pH 7.7 (and being beaten into submission with daily doses of acid)
    CH 290
    CYA 40 (and rising slowly)
    My Pool: 27K gal IG plaster, IntelliFlo i1 pump, Pentair FNS Plus DE Filter, Intellichlor IC40 SWCG, Polaris 3900 Pressure Side Cleaner

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD
    A SWG is normally fine with a lower FC level than you need for bleach. If you are using the FC/CYA Sticky see footnote 3. Or you can use my Pool Calculator, see the link in my signature, to suggest an appropriate FC level.

    When running with higher FC levels you do need to use either the full FAS-DPD test or there are some versions of the DPD test that go up to 10.

    If you bring your TA down to 80 your PH won't go up nearly as fast. Or you can just keep doing what you are doing now and the TA level will come down over time.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    I think we should have cautioned you about hooking up that ole' 426 cu. inch hemi-head block to your SWG.

    Better think about switching to a six-cylinder.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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