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Thread: Chemistry challenges

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    Chemistry challenges

    My water looks clear and sparkly. I have been using bleach for 2 years, this yr pool was pretty clear on opening, got some brownish algae a few days later so I poured in the bleach each day until it was clear. I test my own water usually, but today I got the pool store to check it, the numbers are as follows:
    TC 9.6
    FC 6.4
    PH 7.6
    TA 80
    CYA 60

    Was told my chlorine is locked up, not sure I have ever heard that term before. What are your thoughts?
    AG 24' ( Columbia PL30-6 sand filter), 2hp 2 sp pump, cholorine, Tennessee
    Taylor k- 2006 test kit

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    Mod Squad JVTrain's Avatar
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    Re: Chemistry challenges

    Chlorine lock is a myth, at least how pool stores CLAIM it happens. Insufficient chlorine for your CYA level can happen but that is remedied by a higher chlorine level or lowering CYA.

    What test kit do you have? If it's one of the Recommended Test Kits please post those results instead. Pool store testing is typically not to be trusted.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Patrick_B's Avatar
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    Re: Chemistry challenges

    Which kit did you get? I see your posts from last year with the same basic issues, and going to the Store for testing. If you have your own kit, please provide some accurate numbers and mostly importantly, trust your own test results. Mixing their numbers and our suggestions with their theories and advice is never going to get you past where you are.
    TFP Moderator
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    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    DaninFLA's Avatar
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    Re: Chemistry challenges

    chlorine lock is just a term used by the pool store because they lack the any amount of knowledge. they see that your FC is high but you have algae so they say you have chlorine lock. not true. if those numbers are accurate, which I highly doubt, the only issue you have is algae.

    First off, your CYA isn't 60 and if it is, then they just got lucky. pool stores cant test CYA with any accuracy and im not sure why. the CYA from them is always wrong. if your FC and TC numbers are true, then that means you have roughly 3ppm of CC...which means you have algae issues.

    first item is to get an accurate CYA reading, then move on to a SLAM
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

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    Re: Chemistry challenges

    Quote Originally Posted by JVTrain View Post
    Chlorine lock is a myth, at least how pool stores CLAIM it happens. Insufficient chlorine for your CYA level can happen but that is remedied by a higher chlorine level or lowering CYA.

    What test kit do you have? If it's one of the Recommended Test Kits please post those results instead. Pool store testing is typically not to be trusted.
    These are my today numbers with my Taylor K2006 kit,
    TC 7, PH 7.6, TA 80, CYA 40, CH 80
    Water is clear today.
    AG 24' ( Columbia PL30-6 sand filter), 2hp 2 sp pump, cholorine, Tennessee
    Taylor k- 2006 test kit

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    Re: Chemistry challenges

    Did you measure for CC?
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

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    Re: Chemistry challenges

    CC was 0
    AG 24' ( Columbia PL30-6 sand filter), 2hp 2 sp pump, cholorine, Tennessee
    Taylor k- 2006 test kit

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    Mod Squad JVTrain's Avatar
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    Re: Chemistry challenges

    Your numbers look great!

    How's the water look?

    Pics!

    # Sent from mobile device. Beware of brevity and spelling errors!
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Chemistry challenges

    Water looks good now.
    AG 24' ( Columbia PL30-6 sand filter), 2hp 2 sp pump, cholorine, Tennessee
    Taylor k- 2006 test kit

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