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Thread: Newbie-High CYA

  1. Back To Top    #1

    Join Date
    Mar 2012
    Location
    Boerne, Texas
    Posts
    19

    Newbie-High CYA

    Hello,

    We had some work done on our pool and had a major algae bloom. The algae appears to be gone now but we can't keep the chlorine in the pool. Our CYA level is between 150-180. Since we are in a drought we are not allowed to drain our pool. Is there another way to lower CYA? I'm assuming since the CYA level is high that might be the reason we can't keep the chlorine in the pool?? We have added up to six gallons of liquid shock at a time (per pool company suggestion) but then it drops back to zero the next day.

    We have a Tri-color dispenser and since it appears to raise CYA levels, we have shut it off. Was that the right thing to do?

    Our pool is a 16,000 gallons fiberglass.

    I really would appreciate any information you could provide.

    Thank you,

    Texgal

  2. Back To Top    #2

    Join Date
    Oct 2013
    Location
    Chapin, SC
    Posts
    1,141

    Re: Newbie-High CYA

    Unfortunately, no other way to get rid of the excess CYA you have than to drain and replace. Using Trichlor and/or dichlor will only add to your problem, so yes you did the right thing by shutting it off. According to Pool math, you will have to replace as much as 72% of your water if it is 180. 62% it's 150. if you don't you will need to keep your FC at 18 - 21 depending on your actual cya level compared to 8 if you get your cya to the recommended 50. If you don't have a good testkit, you will have difficulty keeping up with your pools chemistry pool store tests are worth what you pay for them. The recommended test kits are the TF-100 or Taylor k-2006--either of which can be ordered at tftestkits.net.

    Honestly, if those cya numbers are a result of pool store tests, I doubt they are close to what it actually actually is.
    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

  3. Back To Top    #3

    Join Date
    Mar 2012
    Location
    Boerne, Texas
    Posts
    19

    Re: Newbie-High CYA

    timerguy,

    Thank you so much for the quick reply! That was the answer I was afraid I would receive. The TF-100 has been ordered! A part of me fears what the results of that will be but I'm going to give TFP a try. Everyone seems very helpful

    Again, thank you.

  4. Back To Top    #4
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Newbie-High CYA

    Welcome to TFP !
    Congrats on ordering the kit. Best investment you can make for your pool. When it comes post up a full set of results and we'll get you started on getting things fixed up.
    When you get your CYA level back in range your going to see how easy our methods are going to be. You'll have the right tool to maintain your water chemistry without relying on the pool store. They are not on your side. We are ! 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  5. Back To Top    #5
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Location
    Columbia, SC
    Posts
    8,495

    Re: Newbie-High CYA

    Just a heads up, 100 is the limit of the CYA test, so you have to do a diluted test. While the full instructions are in the Pool School, here is the short version. Mix 50% pool water with 50% tap water. Use this mixed sample as your test water. If still at a 100 you will need to dilute more. Here is a great chart by JamesW to explain dilution rates and what you multiply the results by to get an approximation of your CYA level. But, the higher the dilution the it drifts off a true number.

    Pool water......Tap or distilled water.........Multiply result by

    ....1...................1................................2
    ....1...................2................................3
    ....1...................4................................5

    It would help us if you would add your location to your profile and the following information to your signature.


    • The size of your pool in gallons
    • If your pool is an AG (above ground) or IG (in ground)
    • If it's IG, tell us if it's vinyl, plaster/pebble, or fiberglass
    • The type of filter you have (sand, DE, cartridge) and, if you know, the brand and model of the filter.
    • If you know, please tell us the brand and model of the pump, and mention if is it a two speed or variable speed pump.
    • Date of pool build/install, particularly important if less then a year old.
    • What kind/model of water test kit you are using
    • Other significant accessories or options, such as a spa , SWG, or cleaner



      Welcome to TFP!!
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

  6. Back To Top    #6

    Join Date
    Oct 2013
    Location
    Chapin, SC
    Posts
    1,141

    Re: Newbie-High CYA

    If I were you I'd use Tim's 2 tap to 1 pool sample then multiply the results you find by 3. Any result <90 will give you a ballpark number.
    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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