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Thread: interpreting test results and using pool math

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    interpreting test results and using pool math

    Tested today
    PH 7.2
    FC 6.0
    CC 0
    TC 6.0
    CYA 30 (right at the line on tube)
    TA 40 ( 4 drops and it was red, double checked)

    So Im trying to understand on the CYA/FC chart it looks like my FC is too high at 6 it should be 4. So should I try to increase the CYA or lower the FC? Im nervous about getting the CYA too high as I have to use my well water if I need to drain it or truck in more water. So do I set my target at 50 for CYA on the pool math? I see the TA isn't right either, but I don't want to ask too many questions in the same post. Thank you again for this site I'm learning so much
    Hudson New Hampshire
    11000 gal AG 21ft by 52 inch deep round since 7-1-16
    Clearwater II 2hp/2sp cartridge filter
    Well water to add to pool but filled with plain water truck
    TF-100

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    Mr Bruce's Avatar
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    Re: interpreting test results and using pool math

    You can leave your CYA at 30. The FC will probably be gone by tomorrow, if not the end of the day. There is no real harm going over just a little bit of the target.

    Yes, you'll want to get your TA up to 60 at least.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    TA low

    Hi all. My PH doesn't want to stay up and I'm guessing it's a TA thing. So I have ph up but am wondering if I should focus on my elevating my TA first and seeing what it does to the PH or just go for the PH? From reading it looks like my TA is what balances my PH right?

    PH 7.2
    TA 40( double checked 4 drops)
    FC 6.0
    CC 0
    TC 6.0
    CYA 30
    Hudson New Hampshire
    11000 gal AG 21ft by 52 inch deep round since 7-1-16
    Clearwater II 2hp/2sp cartridge filter
    Well water to add to pool but filled with plain water truck
    TF-100

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    Re: interpreting test results and using pool math

    Thank you. So I have pucks floating in pool should i just remove them so as not to add CYA? Hubby is not convinced (yet) that all we need is straight chlorine and add chems separately as needed. We did use 2.5 gallons of chlorine since beginning, and I've added stabilizer as recommended by pool math.
    Hudson New Hampshire
    11000 gal AG 21ft by 52 inch deep round since 7-1-16
    Clearwater II 2hp/2sp cartridge filter
    Well water to add to pool but filled with plain water truck
    TF-100

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    Mod Squad tim5055's Avatar
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    Re: interpreting test results and using pool math

    Quote Originally Posted by shandoug View Post
    Thank you. So I have pucks floating in pool should i just remove them so as not to add CYA? Hubby is not convinced (yet) that all we need is straight chlorine and add chems separately as needed. We did use 2.5 gallons of chlorine since beginning, and I've added stabilizer as recommended by pool math.
    Yup, I would say pull the pucks. Save them for vacation when you need chlorine but won't be there to add it.

    I would think 30 CYA would be fine in NH.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: interpreting test results and using pool math

    If your stabilizer is at your target, you're correct, get those pucks out so you don't end up going too high again.
    8,500gal plaster in-ground with attached spa, two floor drains, one skimmer. Chlorine, City Water.
    Pentair WhisperFlo 1hp Pump, MagnaTek Midcentury EPlus motor, Pentair CleanNClear 200SF Cartridge filter, Purex Triton MiniMax 250 Gas Heater, Pentair SunLite, AutoFill.
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    Re: interpreting test results and using pool math

    Depends. Do you want to raise your CYA? It's a slow way to raise it but it's fine. Are you going on vacation the rest of the summer? Then you could pull them out now and leave yourself a little cushion for putting them back in while you're gone.

    In NH you don't have the brutal sun our TX and CA friends have, so you don't need >30 CYA but it's fine a little higher, just whatever your preference is.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: interpreting test results and using pool math

    pulling the pucks now
    Hudson New Hampshire
    11000 gal AG 21ft by 52 inch deep round since 7-1-16
    Clearwater II 2hp/2sp cartridge filter
    Well water to add to pool but filled with plain water truck
    TF-100

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    Re: interpreting test results and using pool math

    per pool math I added 1 cup of ph up. Will retest and post
    Hudson New Hampshire
    11000 gal AG 21ft by 52 inch deep round since 7-1-16
    Clearwater II 2hp/2sp cartridge filter
    Well water to add to pool but filled with plain water truck
    TF-100

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    Mod Squad tim5055's Avatar
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    Re: interpreting test results and using pool math

    Quote Originally Posted by shandoug View Post
    per pool math I added 1 cup of ph up. Will retest and post
    No more pH up for now. The pucks were keeping the pH low as they are very acidic. Using pucks is like using liquid chlorine and muratic acid at the same time. Many people think liquid chlorine causes pH to rise, but in fact what was happening is that the tabs keep pH artificially low.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: interpreting test results and using pool math

    Quote Originally Posted by tim5055 View Post
    No more pH up for now. The pucks were keeping the pH low as they are very acidic. Using pucks is like using liquid chlorine and muratic acid at the same time. Many people think liquid chlorine causes pH to rise, but in fact what was happening is that the tabs keep pH artificially low.
    Will do. That makes complete sense! I don't know why I couldn't think of that more acid = low ph.
    Hudson New Hampshire
    11000 gal AG 21ft by 52 inch deep round since 7-1-16
    Clearwater II 2hp/2sp cartridge filter
    Well water to add to pool but filled with plain water truck
    TF-100

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