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Thread: CYA at 90ppm

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    CYA at 90ppm

    Time to start draining water?

    23,000 gallons
    CL -10+
    TA-110
    PH - 7.2
    CH - 120
    CYA - 90

    The pool is green. Thanks trichlor pucks!
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Patrick_B's Avatar
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    Re: CYA at 90ppm

    Yep, if you can. That would make it work much faster. Not that practical otherwise.
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    linen's Avatar
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    Re: CYA at 90ppm

    How did you test for cya? If it is truly that high, like Brushpup said, I too would recommend lowering it before the SLAM process.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Mod Squad jblizzle's Avatar
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    Re: CYA at 90ppm

    How did you obtain those test results? Did you not get a kit with the FAS-DPD chlorine test?

    If not, you will need to add it to accurately perform the SLAM process ... http://tftestkits.net/FAS-DPD-Chlorine- ... t-p47.html
    Jason, TFP Moderator
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    Re: CYA at 90ppm

    I used the TF-100 test. Draining has commenced. Any issues with an above ground pool liner. Pool calculator says drain 53%.
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Mod Squad jblizzle's Avatar
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    Re: CYA at 90ppm

    Why did you not report the FC and CC then and instead just said 10+ Cl?

    Regardless, you should replace 50-60% of the water to lower the CYA. As long as you keep at least a foot of water in the pool everywhere, you should not have any issues with the drain/refill.
    Jason, TFP Moderator
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    Re: CYA at 90ppm

    Quote Originally Posted by jblizzle
    Why did you not report the FC and CC then and instead just said 10+ Cl?

    Regardless, you should replace 50-60% of the water to lower the CYA. As long as you keep at least a foot of water in the pool everywhere, you should not have any issues with the drain/refill.
    Sorry ... The FC is 16.5 and the CC is 1.
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Patrick_B's Avatar
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    Re: CYA at 90ppm

    This will be an easy one after the refill.
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    Re: CYA at 90ppm

    Quote Originally Posted by Brushpup
    This will be an easy one after the refill.
    That's good to hear. I started out with a swamp after opening the pool up months ago. I worked it and it was crystal clear. I made my fatal mistake in not monitoring the CYA and kept adding pucks of triclor a couple of times a week and only monitoring the chlorine and PH

    Live and learn. This was my first year of maintaining a pool.
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Re: CYA at 90ppm

    All of us started at the same point.....knowing next to nothing about pools.

    I have been doing this for pretty close to seven years and I still learn something new from this forum almost everyday.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CYA at 90ppm

    Quote Originally Posted by duraleigh
    All of us started at the same point.....knowing next to nothing about pools.

    I have been doing this for pretty close to seven years and I still learn something new from this forum almost everyday.
    This site is amazing. I have learned a ton and of course still have a lot to learn. It's funny to hear co-workers that say, " ah just keep the chlorine and PH and you don't have to worry about anything else." These are the folks that I used to think knew a good bit about pools.

    As for the previous statement that I made saying, "thanks trichlor" .... I can't blame the trichlor .... I put it in!!
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Re: CYA at 90ppm

    Well, pH and Free Chlorine are extremely important, but there is more to it. Understanding the FC relationship to CYA is critical. Many if not most well seasoned pool owners seldom do.
    TFP Moderator
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    Re: CYA at 90ppm

    Well I drained half of the pool and now I'm filling it. Time to learn the SLAM process!
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Re: CYA at 90ppm

    It's kind of fun actually. Not hauling the bleach, but seeing a mess turn into pristine clear water. That is the fun part.
    TFP Moderator
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    Re: CYA at 90ppm

    I agree. When I opened the pool before summer, it was a green swamp with tadpoles to boot. Seeing it go from green to milky ... to clear was fun to watch. I had hardly any CYA and for some reason thought that I could add those pucks occasionally and be ok after pump to waste when vacuuming and rain ....etc. I was wrong. I will stick to the BBB method. Now I can see the relationship of cya and FC, CC. My free chlorine was only half what was needed with that high CYA.
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Re: CYA at 90ppm

    50% of the water was replaced and here are the numbers:

    PH -7.5
    TA -60
    CYA - 40
    FC - 9
    CC - 0
    CH - 100

    To get shock FC up to 16, I added 16 oz of 63% Cal-hypo.... and swept the pool.
    Does it look like I'm on track?
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Re: CYA at 90ppm

    Does it look like I'm on track?
    Absolutely! Nice work on the CYA.

    Now, keep your FC up close to 16 ppm by testing and then redosing back up.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CYA at 90ppm

    We're getting there .....
    Late last night I measured FC and CC:
    FC: 19.5
    CC: .5

    This morning's numbers:
    FC: 16
    CC: 0
    CYA: 40
    PH: 7.5
    CH - 100
    TA: 60

    So I dropped 3.5ppm FC overnight. I'll raise my FC to 20 so hopefully I won't drop below 16 by the end of the day.
    28' round Doughboy AGP (23,000 gallons) 7.5' deep end
    Aquaview sand filter
    Hayward 1.5HP pump

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    Mod Squad jblizzle's Avatar
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    Re: CYA at 90ppm

    No need to test anything but the FC and CC at this point. Looks like you are getting of top of this
    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
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    Patrick_B's Avatar
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    Re: CYA at 90ppm

    Yep, good job there. Keep SLAMing and you be there.
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    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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