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Thread: Test results and a questions

  1. Back To Top    #1

    Join Date
    May 2008
    Location
    New City, NY
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    4

    Test results and a questions

    Testing done by Leslies.

    PH 7.8
    Free Available Chlorine 0
    Total Available Chlorine 0
    Total Alkalinity 100
    CYA 0

    Ordered 12lbs of Cyanuric Acid from an online store should be here tomorrow.

    Bought 1 174 oz and 2 96 oz store brand clorox.

    1) After treating with Cyanuric Acid how long should I wait before using the clorox.?

    2) Should I use all the Cya acid at once

    3) Should I use all the clorox at once

    There is little bit algae on the floor


    25x50 Vinyl inground ~ 45000 gallons. Sand Filter.
    Sun is directly on the pool until 4.30 pm.
    Live in New York


    Thank you all in advance for your help.
    25x50 inground vinyl. 2 skimmers, 5 returns, autofill and Polaris 380. 400000 btu heater.
    1.5 hp Pump, Triton II Sand Filter

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: Test results and a questions

    If the water is basically clear and there are just small spots of algae, you should start adding chlorine right now. Add 5 ppm of chlorine, about 3 1/2 gallons, of 6% bleach, each evening until the CYA has been in for 24 hours. Once the CYA has started to dissolve, switch to measuring the FC level and adding enough chlorine to bring FC up to about 6 (enough so FC is at least 3 the next evening). For the first three days, about half an hour after adding the bleach, brush the entire pool.

    I calculate that you will want about 15 lbs of CYA total, but you don't want to add it all at once. Adding 12 lbs is a good amount to start with, wait a week and then test the CYA level and adjust from there.


    If the water is cloudy or murky, I would try a totally different approach. Add about 8 lbs of CYA, wait 24 hours with the pump running, then start shocking to a FC level of 11, which would be about 8 gallons of 6% bleach to start and plenty more soon afterwards.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    May 2008
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    New City, NY
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    Re: Test results and a questions

    how long does it take for the CYA acid to disslolve.? is there an easier way to dissolve the CYA. Thanks.
    25x50 inground vinyl. 2 skimmers, 5 returns, autofill and Polaris 380. 400000 btu heater.
    1.5 hp Pump, Triton II Sand Filter

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    Mod Squad JohnT's Avatar
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    Apr 2007
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    SW Indiana
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    Re: Test results and a questions

    Quote Originally Posted by JThomas
    how long does it take for the CYA acid to disslolve.? is there an easier way to dissolve the CYA. Thanks.
    Allow a week before you retest. It may disappear more quickly, but it doesn't get fully dissolved.
    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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