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Thread: Water Chemistry

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    Join Date
    May 2015
    Location
    Waukesha, WI
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    2

    Water Chemistry

    First off, I want to say this is a great site and full of great info. This is our second year with the pool, last year I was winging it and after initial issues with no CYA in the pool/ chlorine depletion, things were fine. I just opened the pool this past Saturday, and water/pool was very clean/clear. I wised up and purchased the TF-100 test kit. Great kit. Pool truck topped me off on Monday evening. Ran equipment 16 hours after. Initial test results Tuesday evening around 5pm were as follows: PH 7.4, CYA 40, Chlorine 0. So, I applied a hair over 4 of the 128oz 12.5% jugs from late last year that I stored indoors. Continued running the pump and retested at 10:30 pm. Tested FC to be at 25, I believe my SLAM target would have been 16 FC. Did not get a chance to test early next morning like I should have, but tested at 5pm Wednesday as follows: PH 7.7 which rose probably from the high FC, FC 21, CC 0, Alkalinity tests high per literature I read. Tested again this evening same time around 5pm and FC 16ish, CC 0, PH 7.7 still a bit high. FC now at original SLAM target after 3 days with no CC and very clear water....am I wrong to assume I do not need to 'shock' the pool again? I only lost 4 FC after the first test/ 19 hours. Thanks in advance.
    27' Round Above Ground Vinyl, FloPro16SS Filter, FloPro 1HP Pump

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    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Location
    Columbia, SC
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    8,495

    Re: Water Chemistry

    We really don't recommend a shock process, you either go through a full SLAM of not. If the water is clear, you have no CC the only thing I would suggest is conduct an OCLT. If you pass that you are golden. Time to swim.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    18,768

    Re: Water Chemistry

    I'd question whether you even needed to shock the pool on opening. I'd say you're done.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  4. Back To Top    #4

    Join Date
    May 2015
    Location
    Waukesha, WI
    Posts
    2

    Re: Water Chemistry

    You may be right about not needing it. My initial snap judgement was to throw it in because it was 0, but maybe less would have held. I am still trying to figure this stuff out, lol. Thanks for the replies.
    27' Round Above Ground Vinyl, FloPro16SS Filter, FloPro 1HP Pump

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