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Thread: I got my TF100 test kit! Now what should I fix 1st?

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    I got my TF100 test kit! Now what should I fix 1st?

    My results:

    FC 2.5
    CC 0
    pH 7.5
    TA 80
    CH 140
    CYA 70

    I have the calcium on order at the hardware store (I need ~25 lbs)

    Should I shock first, or drain down to lower CYA ? Is my TA OK ?

    The water looks great except for some greyish dust on the bottom. Could that be mineral salts? I never had it until I started using liquid chlorine a week ago.

    Jill
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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    reebok's Avatar
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    Re: I got my TF100 test kit! Now what should I fix 1st?

    I bet it's dead algae.
    do you use trichlor chlorine tabs? if so, take them out. your TA is ok as long as you don't use tabs (and your cya is high enough).
    I run my cya at 70ppm and it works ok, you just have to use the fas-dpd test every time to be sure of where you're at (unless you're really really familiar with your water).
    your biggest problem is low chlorine. I would get it up to 8ppm tonight and preform an overnight fc loss test to make sure you don't have algae waiting to happen.
    pool-school/overnight_fc_test
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Re: I got my TF100 test kit! Now what should I fix 1st?

    You need to get your FC to at least 5 STAT. With a CYA of 70, you should actually be targeting an FC of around 8. You don't have any CC so you may not need to shock as long as you get the FC up to an effective range quickly and keep in there.

    Draining to reduce the CYA level is your call. I'm running at 60, but I'm also in sunny Florida. Even if you plan to drain/refill you need to raise the FC to match the current CYA level.

    When you get the CH, add most of what you think you need, but not all. Then retest and recalculate how much more is required. This way you don't overshoot your target. I would also decide on your CYA situation before adding the CH, because a drain/refill will require you to add CH again.
    10K IG plaster (9,500 pool + 500 spa)
    Cartridge filter rated 120GPM (Jacuzzi SherLok 120MB)
    Pentair Intelliflo VS3050

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    Re: I got my TF100 test kit! Now what should I fix 1st?

    I've already quit the trichlor tabs, but I don't understand the relationship between TA and trichlor etc. If I never use tabs again am I OK?

    I will raise the FC and do the overnight test tonight. Thanks for your advice!
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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    reebok's Avatar
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    Re: I got my TF100 test kit! Now what should I fix 1st?

    yes you will be fine. I believe there's a higher risk of calcium scaling with a low TA and acidic chlorine sources.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    reebok's Avatar
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    Re: I got my TF100 test kit! Now what should I fix 1st?

    Quote Originally Posted by Cleavitt
    I'm running at 60, but I'm also in sunny Florida.
    I'm glad some place in this state gets sun, cause we sure don't.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Re: I got my TF100 test kit! Now what should I fix 1st?

    Quote Originally Posted by reebok
    I'm glad some place in this state gets sun, cause we sure don't.
    No kidding. I'm actually in Haines City so those clouds are visiting me after they finish with you each day. At least the grass is growing again.
    10K IG plaster (9,500 pool + 500 spa)
    Cartridge filter rated 120GPM (Jacuzzi SherLok 120MB)
    Pentair Intelliflo VS3050

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    Re: I got my TF100 test kit! Now what should I fix 1st?

    Hi, Jill,

    Just to emphasize the good advice already offered......Raise your FC and keep it a little higher than you apparently have been.

    You've solved/are solving the CH issue so that number soon will be good as well.

    I will also bet that what you saw on the pool bottom was dead algae.

    TA and pH are absolutely fine.

    Over the remainder of the Summer, your CYA will slowy go down a little from splashout and refill, that'll allow you to run a little less chlorine but keep an adequate amount in your pool all the time by referring the CYA/chlorine chart in Pool School

    Overall, sounds like you've got great pool water. Nix the pucks for the rest of the summer. Don't sell them, they'll be great for vacations next year when your CYA is down some......I would suggest 50ppm.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: I got my TF100 test kit! Now what should I fix 1st?

    Good morning!

    My FC loss results:

    Last night 8.5
    This AM 6
    CC .5

    What does this tell me exactly? That I'm fighting algae?
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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    Re: I got my TF100 test kit! Now what should I fix 1st?

    Yes you are fighting algae or some other organic matter.

    Keep your FC at shock levels until you loose <1ppm overnight and CC <= .5 I know that sometimes it feels like you will never get there, but eventually you will. Then your water care will be easier that ever before.

    Does not seem that you are too far away.

    dave
    15,500 gal, inground gunite pool with 7 ft spa, 2 speed pump 2hp/.33hp, 3/4 hp booster pump, Intermatic P1353 timer, AutoPilot SC-48, Sand filter with ZeoBest, Heater, that I never use . . .

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    Re: I got my TF100 test kit! Now what should I fix 1st?

    I'm going camping for the weekend so I'll shock it when I get back. I'll have my older son add half a bottle of bleach per day while I'm gone. It's a relief that I'm not that far off.

    Thanks everyone for your help.
    Mike
    • 20k gallon InGround pool, vinyl liner
      Hayward Perflex EC65 DE filter
      Sta-Rite pump
      Raypak Versa 155B heater (rebuilt 2011)

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