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Thread: Surprise CYA reading--a little help, please?

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    LauleaHere&There's Avatar
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    Surprise CYA reading--a little help, please?

    I recently had my pool covered (solar cover) for a week during a stretch of bad weather. Uncovered it a couple of days ago, of course TC was low. Ran the pump and filter as well as the SWG. At the end of the first day, I also checked CYA and the fluid in the tube was absolutely clear. Tested again. Same result. Added about a half-cup of CYA granules (I try to add in small increments because my pool is small) and tested the next day, and the day after. Added another 1/4 cup today. Still clear. I should be getting some result by now, yes? I am getting worried about overtreatment at this point.

    My CYA has always been in the 50-70 range, and I'm not sure why it would drop so low over 6 days.

    The only other thing that has changed is that I opened a new bottle of R-7065, the CYA test standard. Could it be a bad batch?

    TC is rising, now at 3, pH is consistent at 7.8 and water is clear.

    Thanks for your help and advice.

    Renee
    12' round above ground pool. 3,500 gal. Vinyl liner. Waterway Supreme Hi-Flo 48 frame pump. 1.5 hp. SWG. Sand filter with Zeobrite.

    Thanks, members of Trouble Free Pool, for being so friendly and informative!

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    Join Date
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    Huntsville, AL
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    Re: Surprise CYA reading--a little help, please?

    I've had good luck using the pool calculator to determine how much CYA to add and then waiting a week before testing for it (apparently it takes that long to show up in the test).

    Also, are you using the right reagent for the CYA test? Depending upon which test kit you have, I think R-0013 is used in the CYA test. The CYA test standard is used to to check your testing technique (I believe you use it in place of the pool water and you should measure CYA = 50 ppm when the test is done correctly).
    27K gal, IG vinyl, 1.5 HP pump, 24" sand filter, Goldline Aqua Plus SWG

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    LauleaHere&There's Avatar
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    Re: Surprise CYA reading--a little help, please?

    Ah, the light dawns! Maybe I ordered the wrong stuff? The bottle looks the same...
    Thanks, I'll double check.

    Edited to add: Yup. Ordered the wrong stuff. Thanks for the help!
    12' round above ground pool. 3,500 gal. Vinyl liner. Waterway Supreme Hi-Flo 48 frame pump. 1.5 hp. SWG. Sand filter with Zeobrite.

    Thanks, members of Trouble Free Pool, for being so friendly and informative!

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    Join Date
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    Re: Surprise CYA reading--a little help, please?

    You are welcome. Glad it was an easy fix!
    Gordon
    27K gal, IG vinyl, 1.5 HP pump, 24" sand filter, Goldline Aqua Plus SWG

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    Re: Surprise CYA reading--a little help, please?

    But as long as you have the R-7065, you can use it to double-check your testing technique...
    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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