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Thread: Errrr!!! I am sooo not a chemist!!!!

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    Errrr!!! I am sooo not a chemist!!!!

    Well, I am now joining the ranks of those fighting the algae growing on the bottom of the pool. My water is actually still crystal clear as it has been all summer, but that stupid algae is growing on the bottom of the side opposite my return and skimmer (probably another argument for putting in that 2nd return next year!!!).

    But my question - HOW does the CYA just disappear? We have not replaced any water in probably a month.

    7/14 my readings using TF100 test kit:
    FC 5
    CC 0-0.5 (could barely see a hint of pink when put the R0003 in)
    TC 5-5.5
    ph 7.4
    T/A 90
    CYA 45

    We went on vacation then 2 days later Thurs-Sun (7/16-7/19), and we had the neighbor girl add .75gal clorox to the pool on Friday night, then I added more on Sunday when we got home. Readings similar until now the algae shows up. My readings last night 7/31:


    FC 6.5
    CC 0
    TC 6.5
    ph 7.5
    TA 110
    CYA --- 0 ---

    Now I wanted to retest, but I am out of the stuff - apparently tested too often for CYA (just got the test kit about a month and a half ago)

    What the heck happened to my CYA??







    af
    21x41x54" AG Artesian Seville II
    Installed around 2004 - we moved here in 2008
    23,000 gal
    Hayward SwimPro 256T Sand Filter
    1HP 2speed Hayward Power Flo Matrix
    (and have 2HP Hayward Swimpro and a 2hp 2speed Waterway Hi-Flo pump as back up also!! lol)
    No heating - other than Solar SunRings
    Central IL

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    pitguy3's Avatar
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    Re: Errrr!!! I am sooo not a chemist!!!!

    I'm gonna have to bookmark this post!! Mine is doing the same thing... Although we have had a TON of rain over the past few days... I bet I've pumped 4-5 inches of water out of mine! Can't WAIT to see what the experts say!!

    Intex 20x52 above ground pool-
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    dmanb2b's Avatar
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    Re: Errrr!!! I am sooo not a chemist!!!!

    go ahead and perform the overnight FC drop test...it may be time to shock.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Errrr!!! I am sooo not a chemist!!!!

    I can't help with the CYA. I'd get another test result from another source. It's unlikely your CYA has disappeared....not impossible, but unlikely.

    If you have algae, you need to shock your pool to get rid of it. As soon as you confirm the presence or absence of CYA shock according to the CYA/chlorine chaert and get more CYA in your pool if necessary.
    Dave S. - Forum owner
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    TizMe's Avatar
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    Re: Errrr!!! I am sooo not a chemist!!!!

    I would shock like Duraleigh says and maybe take a water sample to the PS and see what they tell you. You need some sort of CYA reading so you know what your shock level should be.
    I would think in this case it would give you and idea if it was relatively close to your previous level ... IMO
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
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    Re: Errrr!!! I am sooo not a chemist!!!!

    Quote Originally Posted by dmanb2b
    go ahead and perform the overnight FC drop test...it may be time to shock.
    I've been shocking the last couple nights. We are having company to spend the night though today, so I have to let it get back to a level which is ok for swimming. But I'll be back to shocking as soon as their car clears the driveway tomorrow!!!

    I got in when it was at FC 8.5 this morning, and it seemed ok. What is the highest the FC can be and still be safe to swim in??
    21x41x54" AG Artesian Seville II
    Installed around 2004 - we moved here in 2008
    23,000 gal
    Hayward SwimPro 256T Sand Filter
    1HP 2speed Hayward Power Flo Matrix
    (and have 2HP Hayward Swimpro and a 2hp 2speed Waterway Hi-Flo pump as back up also!! lol)
    No heating - other than Solar SunRings
    Central IL

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    reebok's Avatar
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    Re: Errrr!!! I am sooo not a chemist!!!!

    without knowing your cya level it's impossible to tell. if your cya is really 0 then no more than 3 or 4ppm. otherwise, some are ok with shock level according to your cya (see chart). some like it lower than that.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Ohm_Boy's Avatar
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    Re: Errrr!!! I am sooo not a chemist!!!!

    What is the highest the FC can be and still be safe to swim in??
    Well, that depends upon the CYA level. It's the CYA that determines how much effective FC you have from your available FC. Generally speaking, anywhere from minimum to shock level on the CYA chart should be fine.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

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