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Thread: Should I raise my CYA?

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    Join Date
    May 2015
    Location
    Roanoke, IL
    Posts
    7

    Should I raise my CYA?

    Current levels this morning: (water is clear and have had ZERO problems this year - )
    PH - 7.5
    FC - 2.5 (added 33 oz. bleach and have been maintaining a level of 4)
    CC - < .5
    TA - 150
    CH - 180
    CYA - < 30 ( the water in the tester at the 30 level is about 3/4 clouded out so I would say that the CYA level is around 20 - 25)

    I have seen greater FC loss (expected) due to heavier use and more sun exposure and with the higher water temps am concerned about algae. I understand that it is better to leave it covered up to reduce FC loss but with the higher outdoor temps, I don't want to leave my solar cover on b/c the water gets too warm.

    Should I try to raise my CYA level to reduce loss from the sun and so that I have a higher FC level in reserve to fight the algae (no problems with it yet), or should I leave the CYA level where it's at?

    Thanks!!
    Installed 2003; 15K gal; IG Vinyl; Tagelus TA-60 sand filter; 1 HP Century/Centurion A.O. Smith BX3-18 single speed pump; Hayward H150 heater; solar cover; manually sweep; add water with softened well water

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    Join Date
    Aug 2013
    Location
    Arab, Alabama
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    422

    Re: Should I raise my CYA?

    I would suggest bringing your cya up to 30 ppm at a minimum and better still try to target around 40 ppm. This should help regarding loss to the sun.
    39YO 13K gallon former SWAMP/MONEY PIT, concrete bottom/Fiberglass Walls, Ecotech VS pump, Hayward Sand Filter, Dolphin DX5 Plus, Loop-Loc safety cover and YES, I have a TFT-100 test kit!

    Shock Level and Maintain - CL/CYA Chart

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    Texas Splash's Avatar
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    Jun 2014
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    South-Central Texas, Marion/San Antonio
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    Re: Should I raise my CYA?

    I agree that you could consider raising your CYA slightly higher. You stated your water is great and everything is fine, so as long as you are sure the FC loss is related to sun exposure, increasing CYA is a sound move. If you have ANY doubt that FC is lost to something other than the sun, then you can always do an Pool School - Perform the Overnight FC Loss Test (OCLT) first, then increase CYA. That's certainly your call. Glad to hear your water is in great shape. Enjoy your summer!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Mod Squad JVTrain's Avatar
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    Feb 2014
    Location
    Central Minnesota
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    Re: Should I raise my CYA?

    I maintained my pool here in MN with 30 CYA early last summer. I bumped it to 40 in late July because I was losing too much chlorine during the day. My chlorine usage definitely went down. Went from a gallon of 12.5% per day (~4 ppm FC) to closer to about half or two-thirds (2-3 ppm FC) depending on sun exposure and usage.
    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

  5. Back To Top    #5

    Join Date
    May 2015
    Location
    Roanoke, IL
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    Re: Should I raise my CYA?

    I do appreciate all of your responses. I will perform the overnight test to make sure it isn't anything else in addition to the losses due to the sun and adjust my CYA to 40 after testing.

    Is it best to raise CYA at night or can I do it anytime during the day?
    Installed 2003; 15K gal; IG Vinyl; Tagelus TA-60 sand filter; 1 HP Century/Centurion A.O. Smith BX3-18 single speed pump; Hayward H150 heater; solar cover; manually sweep; add water with softened well water

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    Texas Splash's Avatar
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    Re: Should I raise my CYA?

    CYA can be raised any time. For your OLCT, we like to remind folks to increase their FC at night to at least 10 or your shock level for a more accurate reading. Good luck!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  7. Back To Top    #7

    Join Date
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    Roanoke, IL
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    Re: Should I raise my CYA?

    Perfect - thanks!!
    Installed 2003; 15K gal; IG Vinyl; Tagelus TA-60 sand filter; 1 HP Century/Centurion A.O. Smith BX3-18 single speed pump; Hayward H150 heater; solar cover; manually sweep; add water with softened well water

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