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Thread: Does my CYA seem a little high?

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    Haley's Avatar
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    Does my CYA seem a little high?

    Hi all,

    So yesterday my numbers seemed quite good and we went swimming last night in our new fill. Afterward I dumped in a cup of bleach and called it a day.

    Yesterday's numbers:
    FC: 5.5
    PH: 7.3
    TA: 140
    CH: 180
    CC:0
    CYA: Didn't test for it because I had just added 24 oz. that morning for the first time

    Today's numbers:
    FC: 6
    PH: 7.4
    TA: 180
    CH: 140
    CYA: 65!
    CC: 0

    What do you think? Also, should I leave our pool cover on when we're not using it? It's a nice, dark heavy one. Thanks for your help!!!
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Re: Does my CYA seem a little high?

    Did you add 24 ounces of CYA by weight or by volume?

    ETA: Meh, really wouldn't make much of a difference whether it was by weight or by volume. 24 oz. should get you really only to 40 +/-. Are you certain about the volume of water in your pool?

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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    By weight I believe. There are 28 oz in my canister of of BioGuard stabilizer (1.75 lb) and I added almost the whole thing into my sock. Did I mess up??
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    I believe so (about the volume), I'm about where the fill line is supposed to be. Should I dump some of the water?
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Re: Does my CYA seem a little high?

    Nah. You can always let a little water out and refill.

    28 oz. should raise a 4400 gallon pool's CYA by 48. The CYA test can be +/- 10 depending on the time of day your read it, the ambient light, and where you are when you read it. I'd wait 3 or 4 days and check again. If it is still high, then replace a little water.

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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    Oh thank you for your help! I'll definitely follow your advice.

    Any thoughts on whether or not I should cover our pool during the day when we're not using it?
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Re: Does my CYA seem a little high?

    Haley, as you probably surmised, 24 oz. of dry CYA would raise your 5300 gallon pool's CYA level up by about 34 ppm, according to the Pool Calculator. I suppose 34 was your approximate target, and you assumed a starting point of 0 CYA before adding it.

    So, either you tested incorrectly, and your level is not really 65 (did you double your result in the testing process somehow?), or there already was some CYA in the water. I hope it was your test that was off.

    What were the lighting conditions when viewing? Bright sun behind you. Or very bright indoor lighting?
    How far away from your eyes when viewing? Not too close.

    Now, keep breathing.

    Will some expert post the exact testing method / advice for Haley, please?

    Thanks.
    Alan in Wellington, FL - near West Palm Beach
    15,200 gal IG, painted plaster, 1988; 200 SqFt cartridge filter, 2013; 1.5 HP 1-speed pump (uprated), 2005; heat pump, 2005;
    soon to repair (dead) SWG AquaRite T-15 cell, 2005, and replace (dead) suction-side cleaner, 2005.
    Almost everything died this winter 2012-'13, and I know we shouldn't complain... but, Arrgh!

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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    I eye-balled the holding back of the 4 oz (my container holds 28 oz. I only needed to add 24 oz.) when I poured into my sock. I'll bet that I put a couple extra ounces in.

    Alanpaul, to answer your questions:

    1. You said, "Haley, as you probably surmised, 24 oz. of dry CYA would raise your 5300 gallon pool's CYA level up by about 34 ppm." I only have a 4,440 gallon pool.

    2. Yes, I started with 0 CYA in the pool. It's a brand new fill.

    3. I will definitely retest in a minute.

    4. The light was indoor, not the brightest. I just woke up, but sunlight was present in the room. I'll keep this in mind when I retest. Should I be outdoors? My eyes were about seven inches from the top of the little plastic thing. LOL!
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Re: Does my CYA seem a little high?

    Yes, outdoors sun to your back tube viewed at about arms length
    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
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    Thank you, Isaac! I just went and opened up both my filter valves to the pool and dumped about 7 inches of water. We all know the CYA is too high and there's no way to get rid of it, and I'm going to have swimmers in the pool later today. So after I'm done filling up those 7 inches I lost, I'll retest. That sound like a plan?
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Butterfly's Avatar
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    Re: Does my CYA seem a little high?

    Quote Originally Posted by Haley
    Thank you, Isaac! I just went and opened up both my filter valves to the pool and dumped about 7 inches of water. We all know the CYA is too high and there's no way to get rid of it, and I'm going to have swimmers in the pool later today. So after I'm done filling up those 7 inches I lost, I'll retest. That sound like a plan?
    Well, 24ozs should be about 40CYA. You don't want to wait and retest?

    Here's a link to the Extended Kit Testing Directions......: stand w/back to sun and hold sample at about waist level:
    extended-test-kit-directions-t25081.html
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    Hi Butterfly, I'm pretty confident that my CYA is around 60-65. (I do believe I added too much.) I figure this way, I can retest after I fill and if I need to add more later, I can. Thank you for the link!
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    UPDATE

    After replacing those several inches earlier, I waited for a bit, re-tested just now... and sweet perfection: 35. My FC looks great too. So we're good. For now.

    Thanks to all who commented! It helped me out so much!!!!
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Re: Does my CYA seem a little high?

    Haley,
    I posted 5300 gallons based on your posted dimensions and the Pool Calculator's... uh...calculations.
    So...maybe your pool isn't quite 15 feet wide or quite 4 feet deep.
    It says 4400 gallons would be the volume of a 15' round pool with 3' 4" of water, approximately.
    Or are we talking about that 7" of water you lost?
    BTW, where did it get to?
    JK. It really doesn't matter, I suppose.

    And now we're thrilled that your numbers are great!!
    Alan in Wellington, FL - near West Palm Beach
    15,200 gal IG, painted plaster, 1988; 200 SqFt cartridge filter, 2013; 1.5 HP 1-speed pump (uprated), 2005; heat pump, 2005;
    soon to repair (dead) SWG AquaRite T-15 cell, 2005, and replace (dead) suction-side cleaner, 2005.
    Almost everything died this winter 2012-'13, and I know we shouldn't complain... but, Arrgh!

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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    Hi Alanpaul! Huh, that's interesting about the pool volume. I'll look into that.

    As for where my 7" went, I posted right after Isaac's post that I went out and dumped about 7" worth of water onto the ground so I could refill with fresh water. Thank goodness it worked!
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    Re: Does my CYA seem a little high?

    Haley,
    Sorry, I misunderstood.
    I didn't realize you dumped OUT 7" of water, first.
    I thought you just put IN 7" of water that wasn't there before.
    Duh!?
    Alan in Wellington, FL - near West Palm Beach
    15,200 gal IG, painted plaster, 1988; 200 SqFt cartridge filter, 2013; 1.5 HP 1-speed pump (uprated), 2005; heat pump, 2005;
    soon to repair (dead) SWG AquaRite T-15 cell, 2005, and replace (dead) suction-side cleaner, 2005.
    Almost everything died this winter 2012-'13, and I know we shouldn't complain... but, Arrgh!

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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    Ahahaha! No worries! I was all over the place trying to decide what to do. Thanks to all of you I'm sitting outside watching my kids do some night swimming.
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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    linen's Avatar
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    Re: Does my CYA seem a little high?

    4440 gallons is correct for that pool according to intex.
    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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    Haley's Avatar
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    Re: Does my CYA seem a little high?

    Aha! Thanks, Linen! That's where I got my number. I am assuming that Intex is calculating only up to my fill line, (around 42") where Pool Calculator is accounting for the full 48" high. Maybe? In any case, I'll keep using my 4,440 gal number. Thanks everyone!
    Intex 15'x48" AG metal frame pool (4,440 gal), Krystal Clear (1600) 14" sand filter, Taylor K2006 test kit, Intex Deluxe Maintenance Kit/vacuum (love it!), Intex Deluxe Skimmer, BBB.

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