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Thread: My First TFT test

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    My First TFT test

    Hi guys finally got to doing the full test today
    Let me know what I should do

    Cl= 5
    Br= 10
    PH= 8.2

    FC= 13
    CC= 1
    CH= 600
    TA= 140
    CYA= 40
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    Richard320's Avatar
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    Re: My First TFT test

    Quote Originally Posted by zacc44 View Post
    Hi guys finally got to doing the full test today
    Let me know what I should do

    Cl= 5
    Br= 10
    PH= 8.2

    FC= 13
    CC= 1
    CH= 600
    TA= 140
    CYA= 40
    A few things spring out at me.
    1) If you did the FAS-DPD powder test, you don't need to do the yellow OTO test.
    2) You can see a discrepancy. One says FC is 5, the other says 13. Oops. Believe the 13.
    3) Unless you're using Bromine as a sanitizer, that reading is useless. Ignore it.
    4) With FC above 10, your pH reading is reading falsely high. Don't add acid to lower it, or you'll go too low.
    5) Repeat that FC & CC test. If CC is really 1, something isn't right.
    6) Your FC is a bit high for your CYA level. Are you in the SLAM process, killing algae? If not, you're too high. It probably won't hurt anything but it will be rough on swimsuits.
    7) If you're running a saltwater chlorine generator, your CYA level needs to be raised.
    8) You forgot the most important part -- what does the water look like? The only people impressed with your readings are here. Your guests only care about how clear the water is.

    Have you read the ABCs of Pool Chemistry, Water Balance for SWGs and How to Use Poolmath? Start there. Also turn down that SWG so you can get an accurate pH test. Try the tests again in a day or two, and if the CYA is still only at 40, plan to raise it. Adjust the pH as soon as you get a reliable pH test result. Lowering pH regularly will eventually lower your TA to a stable respectable number. You don't need to obsess on it. You can't do much about high CH if you live in a hard water area. Get the pH, CYA, and FC under control. By then, you'll understand how things work a little better and you'll probably be able to figure out everything else on your own.
    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.
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    Re: My First TFT test

    i have been busy and havent had time to do much to the pool except skim and brush it (and it stayed looking good)
    weve had some rains here and temps are up so i retested to see what its like

    water temp 71F
    water looks nice and clear just like before
    doesnt smell like chlorine

    ph = 8.2
    FC = 3
    CC = 1 (i dont know maybe im looking too critical)
    TA = 110
    CYA = 25
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    Mod Squad jblizzle's Avatar
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    Re: My First TFT test

    PH way too high. Fix this first.
    Cya too low ... Which will require raising the FC when fixed. Although it may correct itself when less FC is lost to the sun.
    Jason, TFP Moderator
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    Re: My First TFT test

    awesome thanks,

    i also got the lezliezpool salt strips and they indicated salt level about 3500
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  6. Back To Top    #6

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    Re: My First TFT test

    ok so i added some muriatic acid and then some CYA
    should i have done the dichlor or trichlor instead? ... but i mean isnt the SWG supposed to make chlorine?

    ph = 8.2 --> 7.5
    FC = 3 ----> 2
    CC = 1 ----> 0.5
    TA = 110 --> 100
    CYA = 25 --> 40
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    Mod Squad jblizzle's Avatar
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    Re: My First TFT test

    Yes it should. If there is nothing growing in the pool and the sun is not destroying it.
    Jason, TFP Moderator
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    Re: My First TFT test

    This was like 3days after the acids, should I wait more or do I need to fix the chlorine?
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    Mod Squad jblizzle's Avatar
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    Re: My First TFT test

    Well, 3 day old test results are not very helpful.

    If the FC is ever too low you should immediately raise it with bleach.

    How much CYA did you add? What was your target?
    Jason, TFP Moderator
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  10. Back To Top    #10

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    Re: My First TFT test

    I just tested

    PH 7.9 (up again)
    FC 1 ... guess I'm gonna add some chlorine, I wonder if the SWG is broken
    CC 0.5
    TA 100
    CYA 45
    TX/Dallas | 18K ? gal. | Plaster | Jandy valves, Jandy panel, Aqualink RS4
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  11. Back To Top    #11
    Mod Squad jblizzle's Avatar
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    Re: My First TFT test

    Looks like you are only testing (or at least only posting) every 3 days ... that is not going to cut it while you are trying to straighten out your pool.

    What does the water look like?
    Jason, TFP Moderator
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    Re: My First TFT test

    I started testing weekly seemed stable until I added the Muriatic acid/or weather got hotter, and the chlorine started to drop
    The water looks great just like in the winter
    It tastes more salty today but no chlorine taste/smell

    Last night I added ~60oz of Clorox 8% (pool calc estim 64 for goal of 4)
    12h later

    pH still 8
    FC 5
    CC 0.5
    TA 110
    CYA 45
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  13. Back To Top    #13
    Mod Squad jblizzle's Avatar
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    Re: My First TFT test

    With a SWG and high TA, you just are going to have to keep adding acid.
    Jason, TFP Moderator
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    Mod Squad pooldv's Avatar
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    Re: My First TFT test

    Are you running any waterfalls or bubblers? Those will increase your too. Chlorine consumption increases as sunshine and temperatures increase. Can you increase the output of your SWCG? Or increase the run time of the pump so the SWCG runs longer and makes more chlorine?
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    Re: My First TFT test

    the attached spa spills over into the pool so it is kind of a waterfall
    i increased the time from 6h overnight in winter to 12h total hours (3h runs with 3h breaks in between - this seems to skim the pool real good)
    i just increased the SWG from "40%" to "50%"
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    Mod Squad pooldv's Avatar
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    Re: My First TFT test

    Ok, keep testing chlorine until you get it dialed in. Has it been a week since you added cya? If so it is time to test it again. 45 is too low, need to get it up to 60-80. It takes a week for cya to fully dissolve and read correctly on the test.

    Here is some info for you to read on water chemistry and levels for a saltwater pool.
    ABC's of Pool Water Chemistry
    Water Balance for SWCGs
    PoolMath, will tell you how much to add to adjust your levels.
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    Re: My First TFT test

    still dont have a handle on the SWG keeping chlorine stable, but its been raining and what not...
    here's today's tests after all the rain (i added a jug of clorox last night when cl was 1, and some muriatic acid)

    Cl = 5
    pH = 7.6
    TA = 50 - poolcalc says add 211oz NaHCO3 for goal 60-80
    CH = 200 - poolcalc says to add 160oz of CaCl for Goal 250-350
    salinity = 2400 (my SWG says goal is 3000)
    CYA = 30
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    Re: My First TFT test

    What is your CYA?
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    Re: My First TFT test

    got worse CYA = 30 (guess from all the rain)
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    Mod Squad jblizzle's Avatar
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    Re: My First TFT test

    Have you Performed the Overnight Chlorine Loss Test to make sure there is nothing in the water consuming the chlorine?

    I would do that. If you pass, then raise the CYA up so that the SWG has some hope of maintaining FC levels.
    Jason, TFP Moderator
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