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Thread: First Test on Pool

  1. Back To Top    #1

    Join Date
    Mar 2015
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    First Test on Pool

    Hello,

    I am taking over maintenance of our pool after several years of using a pool maintenance company. The pool has an automatic chlorine feeder which was used to provide chlorine via tablets.

    I just received my TF-100 Test Kit and complete the first test. My results are below:

    • FC: 1.5
    • CC: 0.0
    • PH: 7.2
    • CYA: Between 60 and 70
    • TA: 60
    • CH: 175
    • Water is very clear.


    Based on my understand, it appears that the following issues are present:

    • CYA is a bit high for a Non-SWG pool
    • Chlorine is low (the maintenance company said that they generally keep this level during the winter because of the water temperature)
    • PH is low


    Am I correct in these assertions? If so, should I lower the CYA before I raise the Chlorine and PH? I obviously do not want to waste chemicals if I need to cycle some of the water out.

    Are there any other suggestions for bringing my pool into balance? I have reviewed several posts on borates; however, I would like to balance my pool before incorporating any new additions.

    Thank you,

    John
    16x35 In-Ground Vinyl (20,000 Gallons); Cooper Ranger Series Sand Filter; Pentair Legend Pool Cleaner

  2. Back To Top    #2
    JasonLion's Avatar
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    Re: First Test on Pool

    Welcome to TFP!

    While your CYA is indeed a little high, it probably isn't worth replacing water just yet. CYA around 60 to 70 is manageable, and will come down on it's own over time (unless you continue to use the tablet feeder).

    If you water is quite cold, say below 50 degrees, then your pool service is correct that the FC level can be lower than normal. However if the water is above 50 degrees I would bring the FC level up to the recommended level for your CYA level.

    On the PH, it depends on your primary source of chlorine. If you continue to use the tablet feeder, then both PH and TA are a little too low for use with a tablet feeder. I would raise the PH up to 7.8, wait an hour, retest TA, and then raise TA up to around 100-120 if it is below that.

    If you are using bleach/liquid chlorine/SWG for chlorine: While your PH is below our recommended level, again it is in an acceptable range where there is no need to deal with it right away. If PH goes below 7.2 you should raise it. But chances are the PH will drift up on it's own.
    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

  3. Back To Top    #3
    Divin Dave's Avatar
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    Re: First Test on Pool

    Hi John,
    welcome to TFP!

    what JasonLion said!


    Quote Originally Posted by bamajohn View Post
    Hello,

    I am taking over maintenance of our pool after several years of using a pool maintenance company. The pool has an automatic chlorine feeder which was used to provide chlorine via tablets.

    I just received my TF-100 Test Kit and complete the first test. My results are below:

    • FC: 1.5
    • CC: 0.0
    • PH: 7.2
    • CYA: Between 60 and 70
    • TA: 60
    • CH: 175
    • Water is very clear.


    Based on my understand, it appears that the following issues are present:

    • CYA is a bit high for a Non-SWG pool
    • Chlorine is low (the maintenance company said that they generally keep this level during the winter because of the water temperature)
    • PH is low


    Am I correct in these assertions? If so, should I lower the CYA before I raise the Chlorine and PH? I obviously do not want to waste chemicals if I need to cycle some of the water out.

    Are there any other suggestions for bringing my pool into balance? I have reviewed several posts on borates; however, I would like to balance my pool before incorporating any new additions.

    Thank you,

    John
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

  4. Back To Top    #4
    Richard320's Avatar
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    Re: First Test on Pool

    What he said ^^

    I'd just use pool water on the lawn, a few inches at a time, until CYA drops down. No reason to rush. The water's too cold to get in right now, so the pH won't irritate anyone's skin or eyes, so leave it alone. But do get the FC up to where it needs to be for your CYA level.

    It will probably be another month or two before your neighbors all start opening. You'll enjoy your crystal clear pool while they battle the green.
    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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  5. Back To Top    #5
    Patrick_B's Avatar
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    Re: First Test on Pool

    Welcome John!

    Your on the right track for sure, and it sounds like you have a good grasp so far, but your FC is too low for that Cya level.

    Lower levels of FC do make sense in winter, but that is a little risky. You want to start using a Chlorine source without Cya in it right now.

    That means no Trichlor/Dichlor of which pucks and "shock" are usually comprised. Cya 60-70 is manageable, but don't let it climb. The best alternative is Bleach. Plain Bleach from Walmart etc. with no special properties like scented or easy pour.

    You can replace some water to lower Cya for sure, but leave the pH alone. It will come up, although a little slower at your TA. Keep it simple right now, and focus on getting your Cya down a touch, and your FC in range with the proper ratio to that Cya level.
    TFP Moderator
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  6. Back To Top    #6

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    Mar 2015
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    Birmingham, AL
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    Re: First Test on Pool

    Thank you all for the prompt feedback. I was planning to move to a bleach/liquid chlorine solution so I will pick bleach to raise the FC and then continue to monitor CYA and PH levels.

    How long should I wait to retest after adding the bleach? Thirty minutes to an hour?

    Unfortunately it is still too cold to swim but temperatures are finally trending up !

    Thank you,

    John
    16x35 In-Ground Vinyl (20,000 Gallons); Cooper Ranger Series Sand Filter; Pentair Legend Pool Cleaner

  7. Back To Top    #7
    JasonLion's Avatar
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    Re: First Test on Pool

    Yes, 30 minutes to an hour before testing again. 30 minutes for liquid chemicals, an hour for most solid chemicals, 24 hours for salt, and a week for CYA.
    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

  8. Back To Top    #8
    swoopman's Avatar
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    Re: First Test on Pool

    I may be stating something obvious to you but just to be sure: Run the pump during the time between adding bleach and testing.
    TF-100 Test Kit
    22,000 gallon, 20x40 kidney-shape IG plaster pool built in 1986
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  9. Back To Top    #9

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    Re: First Test on Pool

    I was planning to run the pump but thank you for the reminder - sometimes the most obvious things are the ones we miss.
    16x35 In-Ground Vinyl (20,000 Gallons); Cooper Ranger Series Sand Filter; Pentair Legend Pool Cleaner

  10. Back To Top    #10
    Divin Dave's Avatar
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    Re: First Test on Pool

    yes.

    Quote Originally Posted by swoopman View Post
    I may be stating something obvious to you but just to be sure: Run the pump during the time between adding bleach and testing.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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