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Thread: My math was wrong for FC

  1. Back To Top    #1

    Join Date
    May 2014
    Location
    Clinton, Mississippi
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    24

    My math was wrong for FC

    I have been caring for a pool for just over a week now and when i started it was crystal clear and wonderful but had no detectable chlorine level. CYA is just over 100 so I was trying to keep FC at 12. I just realized tonight that I was doing the math wrong and instead of multiplying by .2 with my 25ml sample using the k2006 I was multiplying by .5. So my levels have been around FC 4.8 instead of 12 like I thought.

    I currently do not have a detectable problem... but I am wondering if i should bring the FC level up higher then 12 for a bit or just try to keep it at around 12ish?

    It is currently still crystal clear and wonderful!!!
    ____________________________________________________________ ___________
    15,000 gallon in ground pool with liner, Purex Triton Tagelus sand filter, Pentair Superflo 1HP.... Clinton, MS.

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: My math was wrong for FC

    You should lower your CYA level to something well below 100. The common CYA test reports any level above 100 as 100, so your actual CYA level might be much higher than you think it is.

    It is also a good idea to use a 10 ml sample so the FC test goes by 0.5s. Doing the test by 0.2 is just a waste of reagent.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  3. Back To Top    #3

    Join Date
    May 2014
    Location
    Clinton, Mississippi
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    Re: My math was wrong for FC

    Quote Originally Posted by JasonLion View Post
    You should lower your CYA level to something well below 100. The common CYA test reports any level above 100 as 100, so your actual CYA level might be much higher than you think it is.

    It is also a good idea to use a 10 ml sample so the FC test goes by 0.5s. Doing the test by 0.2 is just a waste of reagent.

    I plan to drain some water and lower my CYA soon... It has just been too wet and rainy to do so. it is drying up so i will probably do so early this week.
    ____________________________________________________________ ___________
    15,000 gallon in ground pool with liner, Purex Triton Tagelus sand filter, Pentair Superflo 1HP.... Clinton, MS.

  4. Back To Top    #4
    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    18,768

    Re: My math was wrong for FC

    Wet and rainy is perfect! Let Mother Nature refill your pool with Calcium-free, CYA-free, free water.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  5. Back To Top    #5

    Join Date
    May 2014
    Location
    Clinton, Mississippi
    Posts
    24

    Re: My math was wrong for FC

    Just to update... I did develop a problem... algae!

    With a dilution test I found CYA to actually be around 220... I drained 3 times and lowered my CYA to 50. I did a SLAM and just finished it yesterday. I had previously stated that my pool was "crystal clear" but I didn't know what that meant... It is AMAZINGLY clear and wonderful now. Thanks to the help of TFP.

    edit:wording...
    ____________________________________________________________ ___________
    15,000 gallon in ground pool with liner, Purex Triton Tagelus sand filter, Pentair Superflo 1HP.... Clinton, MS.

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