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Thread: CYA way over 100

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    CYA way over 100

    My CYA test can't be measured because it becomes too cloudy before it reaches any numbers (so its well over 100). MY pool looks fine but I decided to run tests when my regular chlorine test came up off the charts for a few weeks. I had been putting alot of chlorine in it because I was to busy to give it attention. What should I do????

    TC=26.5(FC 26.5; CC=0)
    TA 120
    CH= not needed
    CYA really can't measure cause never reaches numbers on measuring cylinder
    PH 7


    PS the filtration presure is only around 8PSI cause i apparently am sucking in air somewhere.
    Chris M. 20k, inground, defilter, pebbletek, 1hp motor,Tiger Shark QC (crappy pool cleaner), TF-100

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    Smykowski's Avatar
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    Re: CYA way over 100

    You're not going to want to hear this, but you're going to need to do enough drain and refills to get your CYA into a manageable range.

    In order to follow the TFPC method, you need to know your CYA level, and there's no way to accurately test CYA above 100.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: CYA way over 100

    Thats not a good answer for Calif Boy!! My CYA won't come down when I let up on placing chlorine in the pool?.
    Chris M. 20k, inground, defilter, pebbletek, 1hp motor,Tiger Shark QC (crappy pool cleaner), TF-100

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    Smykowski's Avatar
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    Re: CYA way over 100

    CYA doesn't break down. It only leaves the pool by removing water (through splashout, backwash, or drain/refill).
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: CYA way over 100

    Unfortunately the only way to reduce your CYA is to drain and fill ... although you don't want to drain and fill all at once - it is better to do smaller replacements.

    How are you adding chlorine?
    SwimNPlay AG 15x33 oval 48" high 12k gallons - Used pool set up July 2013
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    Isaac-1's Avatar
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    Re: CYA way over 100

    Like the others have said I see a major water replacement in your future, while CYA does break down over time it is at such a slow rate ( a few percent per year) that water replacement or reverse osmosis treatment (available in few parts of the country) are the only ways to lower it in an operating pool.

    Ike

    p.s. you may want to check on the RO treatment option as it is available in some parts of southern California, price though will likely be comparable to water replacement
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: CYA way over 100

    So drain how much?? It was fine last summer??
    Chris M. 20k, inground, defilter, pebbletek, 1hp motor,Tiger Shark QC (crappy pool cleaner), TF-100

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    pwrstrk's Avatar
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    Re: CYA way over 100

    Pool Math will tell you how much water needs to be replaced to lower CYA to the desired level.
    http://www.troublefreepool.com/calc.html
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Richard320's Avatar
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    Re: CYA way over 100

    Quote Originally Posted by chrismassod View Post
    So drain how much?? It was fine last summer??
    You've been chlorinating with pucks and powders, most likely. That's why the CYA climbed.


    http://www.troublefreepool.com/threa...Kit-Directions has detailed instructions for extremely high CYA testing. When you know the actual CYA number, then you can calculate how much needs to go. Reverse Osmosis is really only available around San Diego and Riverside now.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: CYA way over 100

    How will the extended test measure the cya level when it still only goes to 100?? When mine is obviously over 100?? The directions doesn't tell me what to do after I redo the test with part tap water, e.g. double the value, etc
    Chris M. 20k, inground, defilter, pebbletek, 1hp motor,Tiger Shark QC (crappy pool cleaner), TF-100

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    Re: CYA way over 100

    Same boat as you last year - using TFPC to keep up with your water is not possible with astronomical CYA levels (in my opinion) EDIT: wasn't possible for me to do so, I should say
    Did a total refill b/c replaced our liner this year and couldn't be happier - can now finally take of my water like a normal person! FREE from the constant CYA additions thanks to years of horrible pool store advice.

    Good luck !
    20K gal, IG vinyl, 1 1/2 HP Hayward Super Pump , 100lb sand, installed 2000 - new liner/filter/pump March 2014
    TF-100 test kit

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    Re: CYA way over 100

    I just measured a friends pool @ 160-180 on CYA. I found that the CYA bottle holds approx 15ml to the bottom of the sticker, so I put ~7.5ml of pool water and 7.5ml of tap water, then I added the chemical as normal to obtain that reading.

    I told him he should bring some of his water to my pool after I finish so I can have some of his spare CYA.
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
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    Re: CYA way over 100

    Quote Originally Posted by chrismassod View Post
    How will the extended test measure the cya level when it still only goes to 100?? When mine is obviously over 100?? The directions doesn't tell me what to do after I redo the test with part tap water, e.g. double the value, etc

    If your CYA level is 90 or higher, repeat the test adjusting the procedure as follows:
    Fill the mixing bottle to the lower mark with pool water.
    Continue filling the mixing bottle to the upper mark with tap water.
    Shake briefly to mix.
    Pour off half of the contents of the mixing bottle, so it is again filled to the lower mark.
    Continue the test normally from step 3, but multiply the final result by two.


    This is cut and paste from the extended directions, are you saying that after diluting with tap water you still get over 100? (doubled that would be 200+ if I understand those directions correctly) You may be waayy over... I think I've read here of people diluting even more, but I don't know the specifics. No matter what you're going to have to replace water.

    And again, I'll step back to let the experts chime in.
    18' x 48" (42" water depth) Intex Metal Frame 6,700 Gallons
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    Re: CYA way over 100

    Yes, I had to dilute mine 3 times to get the reading to be below 100 had to multiply it by 8 to get a 320 ppm This was when Leslies was telling my my CYA was 40 for about 5 samples
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
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    Richard320's Avatar
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    Re: CYA way over 100

    Well then, try this:

    put one part pool water and two parts tap water together and mix. It doesn't matter how much of each, as long as you're precise. Use a measuring spoon or something if you don't have a graduated cylinder. Then use that diluted sample to fill the CYA mixing bottle to the line. Then fill the rest of the way with the reagent and mix. Take several readings, pouring the solution back into the mixing bottle and repeating it until you're content with the number. Triple it. You'll probably be +/- 20, but it's close enough to calculate how much you need to drain off.

    Have you been chlorinating with pucks and pwders?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: CYA way over 100

    Pucks
    Chris M. 20k, inground, defilter, pebbletek, 1hp motor,Tiger Shark QC (crappy pool cleaner), TF-100

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