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Thread: CYA question

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    Join Date
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    CYA question

    Hey -

    I've got a new pool (first time pool owner too), opened this year in February. At this point, I've been doing the best I can getting the CYA up. But feel that something isn't quite adding up...

    I understand patience is the name of the CYA game: sock-it-up in the skimmer, let it dissolve for about a day or two, then wait for about a week before testing CYA so the reading is accurate. A slow process....

    So, in the last four months, I've added a total of 11.5lbs of granular CYA, but I'm still hovering between 40-50ppm on the test. I used pool math in reverse, and it indicates that I should be at about 120ppm based on the amount of CYA added for the gallons I've got. I realize this isn't an ideal method of gauging where I'm at - but it's what's handy!

    We've received about 15 inches of rain in the Central Florida area in the four months (average-ish), but that's not necessarily accurate for me at home (rainfall can be hit-or-miss around here). So, the pool is being diluted some.

    I'm typically on the lower side of scale for chlorine where I'd prefer to be a little on the higher side, especially since the pool is over 80degrees now. I test regularly but feel like I'm having to make frequent adjustments.

    Thanks in advance!
    ~Adam 12K gal free-form pool with spa, Hayward EcoStart VS pump, Hayward T-15 SWCG, Hayward C17502 filter, Hayward Heat PumpPro 140k BTU, Stonescapes minipebble. tf-100 & speedstir.
    5.5 foot retaining wall. Build completed in Feb 2015.
    East Central FL.

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    JasonLion's Avatar
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    Re: CYA question

    That could be a sign that you are having some extra water replacement that you are not aware of. One way that can happen is a slow leak masked by an auto fill system or by not noticing how much you are topping off the pool.

    Another possibility is that your CYA isn't as concentrated as you think it is. This is rare, but we have seen 50% cyanuric acid sold as if it was 100%.
    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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    Re: CYA question

    thanks Jason...CYA bag says 98%. it's pinch a penny, suncoast brand, CYA.

    No auto fill system - but have an autodrain - not that that matters here.

    I haven't topped off since April 2 according to my records, other than the rain we've received.


    Is it me? My CYA numbers are consistent going back through my notes...fill to the bottom of the label with water, fill up to top of the label with R0013. Shake. Wait. Shake. Pour until dot is completely obscure.
    Good eyesight, perhaps?!
    ~Adam 12K gal free-form pool with spa, Hayward EcoStart VS pump, Hayward T-15 SWCG, Hayward C17502 filter, Hayward Heat PumpPro 140k BTU, Stonescapes minipebble. tf-100 & speedstir.
    5.5 foot retaining wall. Build completed in Feb 2015.
    East Central FL.

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    Mod Squad tim5055's Avatar
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    Re: CYA question

    Quote Originally Posted by AChristie76 View Post
    Is it me? My CYA numbers are consistent going back through my notes...fill to the bottom of the label with water, fill up to top of the label with R0013. Shake. Wait. Shake. Pour until dot is completely obscure.
    Good eyesight, perhaps?!
    The only addition I have to those instructions is to then pour from the tube back into the mixing bottle and do it again. You can pour back and forth several times to make sure your good eyes are reading it properly.
    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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    Re: CYA question

    thanks tim - i'll try that.

    Does CYA lose it's effectiveness if stored for a while? I had one of the bags opener for probably 2 months until it was used up.
    ~Adam 12K gal free-form pool with spa, Hayward EcoStart VS pump, Hayward T-15 SWCG, Hayward C17502 filter, Hayward Heat PumpPro 140k BTU, Stonescapes minipebble. tf-100 & speedstir.
    5.5 foot retaining wall. Build completed in Feb 2015.
    East Central FL.

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    Mod Squad tim5055's Avatar
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    Re: CYA question

    Quote Originally Posted by AChristie76 View Post
    thanks tim - i'll try that.

    Does CYA lose it's effectiveness if stored for a while? I had one of the bags opener for probably 2 months until it was used up.
    No, not really. I'm sure that tested properly there is some degradation, but not that we can test. It should be "good" for years.
    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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    Mod Squad pooldv's Avatar
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    Re: CYA question

    I have had to add CYA 3 times this spring due to rain dilution. We have had a load of rain. Trust the test.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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