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Thread: Water readings

  1. Back To Top    #1

    Join Date
    May 2010
    Location
    Dayton, Ohio
    Posts
    79

    Water readings

    About 10 days after filling (and after reading and re-reading EVERYTHING from Pool School) this is what I have:

    FC 5
    pH 7.0
    TA 200 (down from 300)
    CYA 55/60

    I have driven my pH down with muriatic acid in order to get the pH down. Am aerating to get it back up and then will use acid again to bring pH down. Will keep on going unti the TA is appropriate. My CYA is a little higher than it should be. Is that ok or is there something I should do about it?

    Any comments would be appreciated.
    AG Intex Ultra Frame
    Round 16 ft x 48 in, 5061 gal
    2500 gph Intex Krystal Clear Cartridge Filter
    BBB

  2. Back To Top    #2
    svenpup's Avatar
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    Nov 2009
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    Sacramento, CA
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    Re: Water readings

    Hi

    Your FC is at the minimum for your CYA. You should target 9 when you add chlorine and don't let it drop below 5.

    Your pH is low, but with a TA of 200 I am sure it will quickly get up past 7.2

    You might want to test the TA of your fill water. Is that where all the TA came from or did you add Baking Soda?

    The high CYA just means you will have to maintain higher FC and if you have to shock that will also require higher FC.

    The only way to bring CYA down is with partial drain and refill. If the pool gets full sun it is probably fine. Splash out and refills will bring it down slowly anyway.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  3. Back To Top    #3

    Join Date
    May 2010
    Location
    Dayton, Ohio
    Posts
    79

    Re: Water readings

    Wow! Thanks for the quick reply. The TA of my fill water was that high (300). The only things that have gone into the pool are 10% liquid chlorine, CYA, and muriatic acid. I would partially drain it to bring the CYA down a bit, but I am just beginning to to get the TA under control. Is it in my best interest to have the CYA down or keep working on the TA situation?
    AG Intex Ultra Frame
    Round 16 ft x 48 in, 5061 gal
    2500 gph Intex Krystal Clear Cartridge Filter
    BBB

  4. Back To Top    #4
    svenpup's Avatar
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    Nov 2009
    Location
    Sacramento, CA
    Posts
    835

    Re: Water readings

    The CYA is fine, just make sure you keep FC over 5 at all times.

    It sounds like you have the situation well in hand.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  5. Back To Top    #5
    frustratedpoolmom's Avatar
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    May 2007
    Location
    SWSuburban Chicago, IL
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    11,965

    Re: Water readings

    I agree, just keep your FC above your "min" at all times and you should be fine, and the CYA will slowly come down.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  6. Back To Top    #6

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Water readings

    It sounds to me like you have a good understanding of what you're doing and that's what BBB is about. I suggest you leave your CYA alone. In your area 40-50 is probably perfect but you will hardly notice the difference, if any. You may even consume a little less chlorine by having it at 50-60. It'll probably come down into the 40-50 range over the summer on it's own, as well.

    As svenpup said, keep your chlorine up. 4-7ppm would probably work but his suggestion of 5-9ppm might be a little safer.

    Anyway, keep working on your TA for now. The CYA may be a little lower on it's own after some time has passed.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    May 2010
    Location
    Dayton, Ohio
    Posts
    79

    Re: Water readings

    Thanks Everyone!
    AG Intex Ultra Frame
    Round 16 ft x 48 in, 5061 gal
    2500 gph Intex Krystal Clear Cartridge Filter
    BBB

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