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Thread: Where does my CYA go?

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    Where does my CYA go?

    My backstory is on the algae board about shocking my pool..

    Anyway, I've been shocking, but I started the season with 0 CYA. I started adding CYA 2 lbs at a time, so I didn't end up with too high of a number.

    Added 2 lbs in a sock in the skimmer. Waited a week, tested. Doesn't register on the TFT kit.

    Added 2 more lbs in a sock in front of the return jet in the center of the pool. Waited a week. Doesn't register on the test.

    Added 2 more lbs in the sock in front of the return jet. Still nothing on the test..

    I'm adding my last 2 lbs of CYA in the sock. My water levels are holding steady; there is not a leak. You would think after 6 lbs something would show up, it's not that big of a pool! Also, I wait at least 3 days after the last of the cya is dissolved before cleaning the filter.

    I'm still fighting algae, because I get such strong sunlight. I get sunburned at 9:30am (changing the motor) and got sunburned tonight at 7pm cleaning the filter. I'm pretty pasty, but maybe that gives you an idea of what kind of light I'm getting.

    My water is slowly getting clearer but I feel like I'm never going to get ahead of the game because I lose most of my chlorine during the day! Anyone have any advice?

    Melissa, sunburned and cranky
    IG gunite freeform pool with attached spa, stone surround, 18,000 gallons, Pentair Tagelus TA60, Pentair Whisperflo WF-8 pump.

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    Mod Squad woodyp's Avatar
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    Re: Where does my CYA go?

    I'd consider taking a sample to the pool store and let them cross check you on the CYA level. That's about the only thing they ever get close to right for me.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    JasonLion's Avatar
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    Re: Where does my CYA go?

    I wouldn't add CYA in such small increments. The amounts you are adding are smaller than the precision of the test, and no where near the amount you should be targeting. Adding 1/2 or 2/3 of the CYA at a time makes sense. Adding 1/5 of the CYA at a time is a waste of time and chlorine.

    Another thing to keep in mind is that you can lose CYA while you have algae if you are not adding enough chlorine at the same time.
    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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    Mod Squad woodyp's Avatar
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    Re: Where does my CYA go?

    Quote Originally Posted by JasonLion
    Another thing to keep in mind is that you can lose CYA while you have algae if you are not adding enough chlorine at the same time.
    ..................Just one more thing I didn't know~
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Re: Where does my CYA go?

    Quote Originally Posted by woodyp
    Quote Originally Posted by JasonLion
    Another thing to keep in mind is that you can lose CYA while you have algae if you are not adding enough chlorine at the same time.
    ..................Just one more thing I didn't know~
    Me either!!!!!! Thanks for the info!
    IG gunite freeform pool with attached spa, stone surround, 18,000 gallons, Pentair Tagelus TA60, Pentair Whisperflo WF-8 pump.

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    JasonLion's Avatar
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    Re: Where does my CYA go?

    Just to clarify, it isn't common to lose CYA while you have algae, but it does happen.
    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: Where does my CYA go?

    OMFG

    I tested the water this morning, and I finally have measurable CYA. I took filling the tube, and I could just barely make out the dot, but there is finally changes!

    Now the question is, did this come from the last two lbs that I just added? My sock was empty after last night, but I thought it takes a week to show up on the test? I'm thinking I should hold off on adding any more until I test again a week later?

    IG gunite freeform pool with attached spa, stone surround, 18,000 gallons, Pentair Tagelus TA60, Pentair Whisperflo WF-8 pump.

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    Re: Where does my CYA go?

    Generally when we add CYA we do not bother to test for at least a week. Just proceed with your calculated value and record as such, that is"CYA 35 calculated from addition last Thursday"
    So, use the CYA value you get based on the 10 lbs you added. When we added stabilizer from walmart to the pool at the beach I was helping with, we tested 3 weeks later and it was all there.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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