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Thread: CYA question, please help

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    CYA question, please help

    I drained my pool water according to the % (43) the pool calculator said to decrease the salt in my water. It was way over.

    I did complete set of tests this morning before I went to pool calculator and added anything back.

    1) I did CYA test in the sunlight with the sun to my back as I read from someone's post here. With that light it was 70. I noticed as I walked to the table that the black dot was still there when I stepped into the shade, so out of curiosity I kept adding and the black dot didn't disappear until the reading was 50 in the shade. Which is more accurate?

    2) Copper measured at 0.1 or 0.2. That's basically nothing with most things. Is that still the case with copper or is it so damaging that even that small amount is not good?

    FC 4
    CC 0
    TC 4
    pH 7.5
    TA 150 always high
    CH 360 should I do something to lower this or I don't need to worry about it?
    CYA 70 sunlight 50 shade
    Salt 3380 yay!

    Thank you. Oh, it hit about 109 degrees here yesterday. I read that a fountain will keep water cooler. Is there something you would suggest for my pool? It seems large to me, but it is very small in comparison to most of yours.
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: CYA question, please help

    The CYA test is pretty hard to get used to at first. For now, call it 60. The next time you do the test, stay in the same lighting (backto the sun) and try to be consistent. When I started, I got other peoples opinion and sorta' arrived at a consensus.

    The test itself is only accurate +or- 10ppm, anyway, so your pool might really be at 60.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
    Jan 2009
    Cupertino, CA

    Re: CYA question, please help

    I've also heard that a fountain can cool the water, but I have no personal experience with that. Running the pump at night might help a little. Running a fountain will also likely cause your pH to increase. But that isn't really a bad thing, because then you'll need to add acid, which will also help lower your TA.

    CH 360 isn't really bad (it's about where mine is) but if you have significant CH in your fill water, it will keep going up. Lower TA some and keep pH around 7.5, it shouldn't be a problem.

    Sorry I don't know what a good or bad copper level is.
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: CYA question, please help

    Copper below 0.3 with a vinyl liner shouldn't cause any problems.
    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

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