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Thread: 2nd reading, what happened?

  1. Back To Top    #1

    Join Date
    Sep 2009
    Frederick County, MD

    2nd reading, what happened?

    I really thought I was going right, then I got some strange readings today.

    Previous Readings (last Sunday)
    FC: 2
    CC: 0.5
    TC: 2.5
    PH: 7.5
    TA: 110
    CH: 180
    CYA: 0

    Low CYA, so I took a baby step of adding 4 lbs of 96% CYA (HTH from WalMart) via sock in front of a return early last week.

    Today's readings are really a mystery to me, specifically the FC.

    FC: 18
    CC: 0
    TC: 18
    PH: 7.5
    TA: 130
    CH: 160
    CYA: 20

    We are having a rock path laid leading to the pool, so I left the solar cover on for the past 4 days or so to keep the dirt down and we have not been in since last weekend. I did hit the "boost" button a couple of days ago on the SWCG after the CYA was in to push up the chlorine a bit as I needed to get more FC in since I now had some CYA.

    I did the FC test 2x so I am pretty sure I did it right.

    I am going to take the solar cover off to let the sun burn off a little chlorine, but I could also use a little advice from the masses here.

    I am also a little confused by the recommended levels as called for in the Pool Calculator. They do not seem to match up with what is suggested in the threads. If someone can post recommended levels, I will begin to aim for them.

    Thanks in advance.........

    Southern Frederick County, MD - Leisure Moroccan 38 Fiberglass Pool - 19,800 gallons
    Pentair 1.5 hp 2 speed pump - Cartridge filter - Dolphin robot - TF-100 Test Kit - SWCG

  2. Back To Top    #2

    Re: 2nd reading, what happened?

    Sounds like Boost plus cover equals a lot of chlorine.

    The increase in CYA would have helped you to keep the chlorine generated while the cover was off. I don't know what your target was for the 4 lbs but even if it is not showing on test you know it is in there. So with the CYA higher you may have been retaining more of the chlorine, then you went to Boost and covered up for 4 days. I don't know what you can produce on Boost but with the cover on you didn't lose any of it.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: 2nd reading, what happened?

    The solar cover is helping you maintain a high FC level. When you remove the cover things will be very different.
    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

  4. Back To Top    #4
    Butterfly's Avatar
    Join Date
    May 2007
    South Carolina

    Re: 2nd reading, what happened?

    If someone can post recommended levels, I will begin to aim for them.
    Here's the Pool School article for SWG water balance (recommendations):

    Holler if you have questions.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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