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Thread: New convert with high CYA

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    New convert with high CYA

    I have been using 3" Trichlor tabs in my Rainbow chlorinator and performing my own testing with a basic 4 kit for the five years we have owned our pool. Last summer was the first time I've had algae issues, thanks to a complete drain and refill for a pool remodel several years ago that kept the CYA in check for a time. I took my water to the pool store multiple times for testing and received a different answer each time regarding the cause of my algae. Thankfully I found this site and figured I must have high stabilizer levels and would need to do a partial drain to remedy. But with a new baby joining our family last summer I wasn't prepared to deal with it, so here I am.

    I just received my TF100 kit and performed the first tests today. The water is clear with a tendency for algae in the corners of the steps and on the Polaris bag. My results are:

    FC 2
    TC 2
    pH 7.6
    TA 90
    CH 500
    CYA 130

    My question is this:

    I know I need to do a partial drain and refill to get both the CYA and CH in check, but we will be out of town for two weeks at the beginning of June. Do I do the drain and refill now, start chlorinating with bleach, and then use tablets while we are gone? I don't know how else to chlorinate the pool while we're away. Will two weeks use of tablets raise the CYA back up by much?
    16,000 gal. IG plaster, 1.5 HP WhisperFlo pump, 320 sq ft cartridge filter, Polaris 280

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    Mod Squad JohnT's Avatar
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    Re: New convert with high CYA

    Welcome to TFP!

    How many tablets a week do you normally use?
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: New convert with high CYA

    On the current settings, 2-3 tablets per week. I want to start using bleach to chlorinate and give up the tablets, but wondering if I should just wait until we return from vacation to make the switch...
    16,000 gal. IG plaster, 1.5 HP WhisperFlo pump, 320 sq ft cartridge filter, Polaris 280

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    Mod Squad JohnT's Avatar
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    Re: New convert with high CYA

    Two weeks will probably give you an increase of about 15ppm CYA.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: New convert with high CYA

    Okay, so I will drain more than the recommended 69% to make up for the 15 ppm gain. Any recommendations for submersible pumps for the drain? Rent vs. buy? Brands?

    Thank you for the help!
    16,000 gal. IG plaster, 1.5 HP WhisperFlo pump, 320 sq ft cartridge filter, Polaris 280

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    Casey's Avatar
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    Re: New convert with high CYA

    No one can answer on whether you should rent or buy but you're doing the right thing by getting the CYA level down now before you leave. You could always SLAM the pool and cover it with a solar cover (of course after the drain/refill). A lot of people do it that way too.

    Welcome to TFP and congrats on the kit and taking control of your pool by using TFPC.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Re: New convert with high CYA

    Update:

    I drained 80% and refilled the pool. I just turned the pump on, thinking I need to run it constantly for awhile...? Here are the new test results:

    pH 8.2
    FC 0.5
    CC 1.5
    CH 225
    TA 100
    CYA 25 (yay! Much better than 130!)

    I leave in one week for vacation, the CYA level will increase a bit then since I will use tabs while away. I know I need to add bleach to get rid of the CC and increase the FC, add acid to decrease my pH, and add something to increase my CH (will need to purchase this, have never had to increase CH before). What do I do first?
    16,000 gal. IG plaster, 1.5 HP WhisperFlo pump, 320 sq ft cartridge filter, Polaris 280

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    Re: New convert with high CYA

    Time to use those tabs to get your cya back up a little. 30-50 is a good range. You'll need to get your FC up too. Use some bleach to initially get it up then let the pucks do their job.
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
    Intermatic P1353ME digital timer w/freeze sensor
    CircuPool Si-45 SWCG System
    Polaris 280 vacuum/Polaris PB4-60 boost pump
    Pentair IntelliFlo VS 3hp Pump--Pentair sand filter

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    Re: New convert with high CYA

    Drop the pH with some MA, and use the pucks to bring your chlorine and CYA up.
    12000 Gallon IG Plaster built 2/15/2014. Jandy 340 sg ft 127 gpm filter, Jandy 1 HP stealth pump. Circupool RJ-45 SWG (overkill). TF-100 with Speed Stir.

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    Mod Squad JVTrain's Avatar
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    Re: New convert with high CYA

    I would get your CYA up to 30. So not much. While raising CYA, SLAM the pool following the instructions here: SLAM. You'll need one of the recommended test kits with a FAS-DPD chlorine test to complete it properly. I'd recommend the TF 100. With the SLAM, adjust pH first, then start maintaining shock levels of FC with liquid bleach.

    Then when you're gone, you can use the tablets and your CYA should be in the 45-50 range, which is a bit high on the 30-50 scale but being in Houston, you likely get quite a bit of sun so a little bit higher CYA is OK. If you just use bleach to chlorinate after that, you'd shouldn't have a problem.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: New convert with high CYA

    and add something to increase my CH
    I would suggest you leave your CH alone. It is borderline low and will creep slowly upward over the season. You will probably be at 250 soon enough and maybe 300 by seasons end.

    If your water is clear, I would suggest an elevated FC level of about 10 ppm FC but not a complete SLAM. I think that will drop you CC's down to .5 ppm or less in a day or two.

    Report back that your water whether your water is clear or not.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: New convert with high CYA

    Water is clear and sparkling! Have tested and added bleach several times since last night, only added enough to bring my FC to recommended normal level 2-6 ppm, not SLAM levels. CC is now at 0.5, FC at 2 ppm, pH 7.6. I used more bleach than I would have guessed I would need, 2 gal. of 10%. I went ahead and put one trichlor tablet in my chlorinator to raise my CYA a bit. Thanks for all the input! I will leave my CH alone, was wondering about that myself since we have very hard water here.
    16,000 gal. IG plaster, 1.5 HP WhisperFlo pump, 320 sq ft cartridge filter, Polaris 280

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    Re: New convert with high CYA

    16,000 gal. IG plaster, 1.5 HP WhisperFlo pump, 320 sq ft cartridge filter, Polaris 280

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    Re: New convert with high CYA

    Nice Pool. Whens the BBQ?
    12000 Gallon IG Plaster built 2/15/2014. Jandy 340 sg ft 127 gpm filter, Jandy 1 HP stealth pump. Circupool RJ-45 SWG (overkill). TF-100 with Speed Stir.

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    Re: New convert with high CYA

    Ha! As soon as the water is warm enough to tolerate! Did the overnight chlorine loss test last night and only lost 1 ppm, CC still 0.5. Can I start testing and adding bleach just once a day now?
    16,000 gal. IG plaster, 1.5 HP WhisperFlo pump, 320 sq ft cartridge filter, Polaris 280

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