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Thread: TF-100 Test results...opinions on next steps?

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    when_in_TN's Avatar
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    TF-100 Test results...opinions on next steps?

    I've been following this thread.
    New Member New Pool Owner Many Questions
    Tried the 10 minute drill for myself Wed. night. Ran out of bleach after 16 gallons. I did it again last night, started around 8 pm and 22 gallons later finally got to where it would hold at 10 for ten or fifteen minutes around midnight. I put in enough soda ash to raise the pH a little, waited a while then put in shock level FC for my CYA level. I raised FC to 14 one more time before I went to sleep. Water looks great other than some dead algae that my filter will just not keep out. After testing this morning these are my results:

    FC 4
    CC <.5 (but prob not quite 0)
    pH <6.8 (base demand test was 12 drops to get to 7.4)
    CYA 35
    TA 40
    CH 150


    Questions: Should I continue raising the FC to shock level today or just raise the pH and wait to do the OCLT test?
    Bought a home with a pool. Inspector comments in parentheses. 20'x40'x8' IG 32,000 gal.(One wall has crooked coping and concrete deck has shifted) Vinyl liner (needs replacement in near future) Hayward S240 - 300 lb sand filter(good except small leak)
    Hayward 1.5 HP Superpump(good with exception of small leak) TF-100

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    Mod Squad JVTrain's Avatar
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    Re: TF-100 Test results...opinions on next steps?

    Get that pH up as soon as you can. Borax would be best to do so. Target a pH of 7.2.

    Then raise your FC back to shock level and if you like, perform the OCLT test tonight.

    Congrats on getting through the ammonia! It's a bear when you have that much. Typically though when you have ammonia, you'll have 0 ppm CYA. Did you have to add CYA to get to 35 ppm after getting rid of the ammonia?
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    when_in_TN's Avatar
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    Re: TF-100 Test results...opinions on next steps?

    Those results were from about 2 hours ago. Haven't added anything. Just now the FC 3. CC is still <.5.

    - - - Updated - - -

    Ok. Working on pH going up.
    Bought a home with a pool. Inspector comments in parentheses. 20'x40'x8' IG 32,000 gal.(One wall has crooked coping and concrete deck has shifted) Vinyl liner (needs replacement in near future) Hayward S240 - 300 lb sand filter(good except small leak)
    Hayward 1.5 HP Superpump(good with exception of small leak) TF-100

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    when_in_TN's Avatar
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    Re: TF-100 Test results...opinions on next steps?

    I did have to add CYA because it was less than 30 when I started trying to manage it. It's now around 36. It has been difficult to judge the CYA level. I wish there was a less subjective method. We have major leaking from the pump, plumbing, and valve and the service man I contacted said it will be next week before he can come out. My test lat night was
    FC 15
    CC 0
    PH 7.4
    CYA 36
    TA 100
    CH 130
    This morning was the same except for
    7:30 AM. FC 14 and PH 7.5
    10:30 AM FC 13
    At what rate should FC decline afterwards that would indicate a problem?

    I'm concerned that what I had was mustard algae and with the system leaking so much on filter I ve been keeping on recirculate mostly. I only filter for about and hour while I vacuum. What I vacuum shows up in the pool within a couple of hours.

    Since I passed the OCLT should I proceed with the mustard shock level even though my filter isn't functioning correctly?
    Bought a home with a pool. Inspector comments in parentheses. 20'x40'x8' IG 32,000 gal.(One wall has crooked coping and concrete deck has shifted) Vinyl liner (needs replacement in near future) Hayward S240 - 300 lb sand filter(good except small leak)
    Hayward 1.5 HP Superpump(good with exception of small leak) TF-100

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    Mod Squad pooldv's Avatar
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    Re: TF-100 Test results...opinions on next steps?

    Sure, that is fine to to mustard shock next. With CYA always round up to the next 10, that will keep you covered on FC. A little more chlorine is always better than a little less.
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    when_in_TN's Avatar
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    Re: TF-100 Test results...opinions on next steps?

    So at what rate should FC decline afterwards that would indicate a problem?
    Bought a home with a pool. Inspector comments in parentheses. 20'x40'x8' IG 32,000 gal.(One wall has crooked coping and concrete deck has shifted) Vinyl liner (needs replacement in near future) Hayward S240 - 300 lb sand filter(good except small leak)
    Hayward 1.5 HP Superpump(good with exception of small leak) TF-100

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