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Thread: chlorine drop

  1. Back To Top    #1
    pepsiholic's Avatar
    Join Date
    May 2009
    Location
    Fairmont, WV
    Posts
    362

    chlorine drop

    Hi everyone. I have a question I hope one of you can help me with. I am very diligent about dosing my pool eveynight and have never let the chlorine drop below the recommended level for my cya, which ranges about 40-45. I tested this morning and it was about 5.5, so I bumped it up to 7.5 this afternoon, because I knew my daughter and her friend would be in there for a bit. When I tested it again after sunset it was down to 4 but had a CC of 1. I know neither teenager had on any oils or tanning lotion or anything so that wouldn't be the cause. We have been having extremely hot temps for ths area, being close to 100 and above for the past week and a half, so I don' know if that would be the cause for the CC's or not.

    I went ahead and started the shock process and bumped my chlorine up to 20, this is the 2nd time in 2 weeks this has happened. I attributed the first time to the massive storm we had roll through the arealast week, but now I'm not real sure what is going on.

    I guess I'm just wondering if it is the extreme heat causing this or what. I dose every night around 8:30 pm to be ready for the next day and I test every night and re-dose. I'm not understanding how it can be perfect all week and then boom, at the end of the week severe drop in chlorine and CC's. Any ideas on what might be going on?

    Here are my numbers as of this evening:
    FC 21
    CC .5
    TC 21.5
    ph 7.5
    TA 140
    CYA 40-45-ish

    Thanks much for your input.
    24 x 52 Round AG Outback Empire Pool 13,500 gal.
    1 HP Hayward Power-Flo pump w/Hayward 18" 150lb. sand filter
    TF-100 test kit & SpeedStir
    Wanda the Whale Vacuum

  2. Back To Top    #2
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: chlorine drop

    A slight rise in CC level is not uncommon after swimming. It could be the the high heat also is adding to your CC. In the future just raise your FC up to the top of your normal range and test in a couples hours to see if the CC is gone. Since you already brought it to shock level, it is fine, it is likely you will pass the OCLT tonight.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  3. Back To Top    #3
    pepsiholic's Avatar
    Join Date
    May 2009
    Location
    Fairmont, WV
    Posts
    362

    Re: chlorine drop

    OK, Thanks. I'm probably just being paranoid, because, I have never had an algae outbreak since I started this method. The water has remained crystal clear and sparkily, but the CC's were throwing me off. The water is soo warm right now, it's like bathwater, not even refreshing at this point...lol
    24 x 52 Round AG Outback Empire Pool 13,500 gal.
    1 HP Hayward Power-Flo pump w/Hayward 18" 150lb. sand filter
    TF-100 test kit & SpeedStir
    Wanda the Whale Vacuum

  4. Back To Top    #4

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: chlorine drop

    The warmer the water, the faster things will grow in the pool. As a result, your FC gets used up faster.

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