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Thread: I finally got my TF100 in - readings and advice please

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    I finally got my TF100 in - readings and advice please

    Well, my first set of numbers is in

    FC 0
    TC 2
    PH 7.6
    ALK 140
    CH 80
    CYA 40


    Since my TC is higher than my FC and my water is cloudy I am shocking at 16ppm (based on my CYA reading of 40) until my water holds overnight with less than 1ppm FC loss. I have already lost some chlorine since sundown and adjusted to keep it at 16ppm overnight. However, I have three questions.


    1) I am assuming that I don't need to add acid and that an alkalinity of 140 and PH is okay based on what I have read in this forum, although I did add a couple of leftover trichlor pucks to my feeder to deal with this.

    2) My CH doesn't matter because I have a vinyl liner correct? Do I even need to test for this from now on?


    3) I would also like advice on whether I should raise my CYA to 50-70 to battle the Alabama sun after I finish this shocking process by using a little Dichlor?
    Wes
    Birmingham, AL

    22000 Gallon In Ground Pool, Vinyl Liner, Sand Filter.

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    Re: I finally got my TF100 in - readings and advice please

    You seem to have this pretty well understood. Those leftover trichlor pucks will not add much to the pool, your pool is about the size of mine and that is around 1 ppm of CYA per puck maybe 1.4, I forget. Not much anyhow.

    Yes, CH does not matter for you until it gets really high. You could still get scale at high CH values, but low CH won't matter to the vinyl like it would to plaster.

    Yes, you will probably want to raise the CYA a bit when you are done. You may want to keep a chart and see how your FC usage is. I prefer to run a bit low on the CYA at the start of summer so that when I take a trip I can switch on the feeder and not worry too much about the CYA it will add. A week or two gone can add 10 or 20 points to the CYA which is no big deal starting from 40, but is a big deal if you are already at 70.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: I finally got my TF100 in - readings and advice please

    Yes, CC is greater than 0.5, you need to keep shocking.

    1) Those PH and TA numbers are fine for now. When everything is cleaned up you might want to adjust them.
    2) Correct. Test CH two or three times a year to make sure it never gets too high.
    3) After you are done shocking and everything is balanced, raising CYA a little is worth thinking about. For now leave it where it is.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Richard320's Avatar
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    Jan 2010
    Location
    San Dimas, CA (LA County)
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    18,768

    Re: I finally got my TF100 in - readings and advice please

    Welcome!

    It appears you've done your homework and spent some time in Pool School!

    You don't need any advice - seems like you understand it pretty well. But we're here to reassure you when you need it.
    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!

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    Re: I finally got my TF100 in - readings and advice please

    Thanks for the help. I like to learn, but I also like to be told I'm doing it right!
    Wes
    Birmingham, AL

    22000 Gallon In Ground Pool, Vinyl Liner, Sand Filter.

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