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Thread: Phosphates and CYA Levels. Is there a link?

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    Join Date
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    Phosphates and CYA Levels. Is there a link?

    Hi,

    I'm a rather new pool owner. I had a question regarding the relation of phosphate removers and CYA levels. Specifically, is there a link between the two. Up until yesterday I did my testing at the pool store. I fell victim to the recommendation of using phosphate remover because my FC and TC levels were at 0. Once I did, the water turned murky which I discovered here is a common occurrence. I am in the process of running the pump to clear the water, cleaning the filter every time the PSI jumps 10.

    Deciding that the stores won't fool me twice, I have been studying here and have bought a Taylor Test Kit from Leslie's and recently did a test. 2 days ago, prior to using the phosphate remover, my CYA (Stabilizer) levels were at 60 ppm. Doing it on my own today my CYA level was well over 100.

    My results were:

    TC: 2ppm
    FC: 1ppm
    PH: 7.4
    Alk: 90ppm
    CH: 480ppm


    So, is there any reason why I would be getting a much higher CYA that what the store test reported 2 days later?
    FL Resident
    IG 18,000 gal plaster
    Hayward Swim Clear Cartridge Filter
    Hayward Swimpure Extreme swcg
    A.O. 1HP motor

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    Mod Squad jblizzle's Avatar
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    Re: Phosphates and CYA Levels. Is there a link?

    No link.
    Likely it is just that pool store testing is really that bad. We see it every day.
    But maybe the cloudiness from the phosphate remover is messing with the CYA test? (doubtful)

    Which Taylor kit did you get? Does it have the FAS-DPD chlorine test?
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Phosphates and CYA Levels. Is there a link?

    Thanks for the info. It's a K-2005 DPD testing kit. It was my first run testing on my own and I haven't yet made my way through the pool school section of the forums yet.

    The store had me drain the pool 6 inches and refill to lower the CH as well as add 45 lbs. of salt while turning my swg up to 100 output. I guess I just have to keep an eye on it over the next few days and report back after I've studied more and watched a few videos.
    FL Resident
    IG 18,000 gal plaster
    Hayward Swim Clear Cartridge Filter
    Hayward Swimpure Extreme swcg
    A.O. 1HP motor

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    Mod Squad jblizzle's Avatar
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    Re: Phosphates and CYA Levels. Is there a link?

    Do not rely on the SWG to raise the FC. Just add bleach.

    You also need to add the FAS-DPD Chlorine Test to get the equivalent to the K-2006.

    Start with these:

    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool
    Water Balance for SWGs
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Join Date
    Jun 2016
    Location
    Lakeland, FL
    Posts
    30

    Re: Phosphates and CYA Levels. Is there a link?

    Thanks, will do!
    FL Resident
    IG 18,000 gal plaster
    Hayward Swim Clear Cartridge Filter
    Hayward Swimpure Extreme swcg
    A.O. 1HP motor

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