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Thread: CYA Number Question

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    CYA Number Question

    I have read through pool school almost everyday for the last 2 weeks, Thanks for the great info.

    I bought my test kit from the recommended providers. I got the K-2006. I figured I would start with measuring the CYA to figure out how much bleach I needed to add. Last night I tested the CYA levels twice. Both times the test kit says to drip the solution into the CYA tube until you can not see the bottom black stopper. Both times for the test, the solution was totally clear.

    I just opened the pool on Sunday. I added 4000 gallons. I have an AG oval that holds about 12000 gallons. It is in a VERY sunny area.

    So my question is: Is my test kit unable to read the low levels of CYA or is my CYA so bad that it will never get cloudy?

    Thanks for any advice.
    16'x32' oval AG; 12000 gallons; Hayward sand filter; 1 HP Pump

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    DaveNJ's Avatar
    Join Date
    May 2007
    Toms River, NJ

    Re: CYA Number Question

    Welcome to TFP.
    Is there algae. How do you sanitize the pool, Inline chlorinator, floater, bleach. Post the numbers you measured with your kit.
    IG 18x36 oval vinyl, Spill over spa, Northstar 2hp-2spd, 2.5" piping, S310T 500lb Sand filter, 400k gas heater, AutoPilot SWCG

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: CYA Number Question

    Low CYA levels are very tough to read. I like to mix the CYA sample first, then perform the rest of the tests before I go back and do the CYA test to ensure there is plenty of time for the sample to cloud. If you're able to fill the tube and still see the bottom, you likely have little to no CYA.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  4. Back To Top    #4

    Re: CYA Number Question

    I shocked the pool with 2-96 oz bleach on Sunday. There is no algae visible. The sidewalls are quite slimy so I need to get in, BRRRR, and scrub the walls.

    Sorry, I did not take a full set of numbers as I thought I was doing something wrong with the CYA test.
    16'x32' oval AG; 12000 gallons; Hayward sand filter; 1 HP Pump

  5. Back To Top    #5

    Join Date
    Jan 2009
    Cupertino, CA

    Re: CYA Number Question

    With essentially no CYA, your chlorine will be burned off by the sun in a couple of hours. Get some CYA in there pronto!
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  6. Back To Top    #6

    Re: CYA Number Question

    If you mixed the solution and pool water for at least 30 seconds, and it never got cloudy, I'd say too that you have no CYA.
    27' round AG, sand, Ohio, well water, 19,000 gallons approx., New owners to the pool.

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