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Thread: How to measure high pH

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    How to measure high pH

    My pH is always drifting over 8, likely due to my spa spillover. I think my natural level may be right around there, as I am lowering it and it constantly rises, but I want to measure it exactly to be sure it isn't too high and to see if it plateaus somewhere. How can I measure a pH above 8? I have the Taylor K-2006 kit. I know the TF-100 goes to 8.2, but I think I would need something that goes higher to be sure I'm not over 8.2. Is there a way to extraploate pH based on the acid demand test? Pool looks crystal clear and is wonderful to swim in - just want to keep an eye on things.

    Current readings are:

    FC: 4.5
    CC: 0
    pH: 8+
    Acid demand: 2 drops gets me to 7.6 or 7.4 (forgot which)
    TA: 60
    CH: 250
    CYA: 40
    Borates: 50
    Temp: 86 F

    Thanks!
    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

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    JasonLion's Avatar
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    Re: How to measure high pH

    You should keep the PH below 8.0. This will be simpler if you let the TA come down further. With borates in the water you can allow TA to come down as low as 40, which should help with the constant PH increases.

    Many electronic PH meters will read well above 8.0, but they require frequent calibration. None of the drop based tests give both precision and a wide range.
    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

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    Re: How to measure high pH

    OK, thanks. I will try that. But, according to Pool Calc, if I bring pH down to 7.4-7.6 and TA to 40, my CSI hits or hovers around -0.6. Any suggestions on how to handle that?
    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

  4. Back To Top    #4
    JasonLion's Avatar
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    Re: How to measure high pH

    Raise the CH level a little to compensate.
    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

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    Re: How to measure high pH

    Quote Originally Posted by HofstraJet
    OK, thanks. I will try that. But, according to Pool Calc, if I bring pH down to 7.4-7.6 and TA to 40, my CSI hits or hovers around -0.6. Any suggestions on how to handle that?
    Also, as Jason noted, you only need to keep the pH below 8.0, you don't need to go down as far as 7.4 to 7.6, you can keep it closer to 7.8 to reduce pH rise.

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    Re: How to measure high pH

    Lowered the pH to 7.0 with muriatic acid and waiting for it to rise. Here are the numbers as of this morning:

    FC: 5
    pH: 7.0
    TA: 40
    CH: 250
    CYA: 40
    Borates: 50

    My CSI is -0.96, according to Pool Calculator, which is bad. I expect pH to rise and hopefully level out at around 7.8. My question now is how quickly will I see problems with the concrete - is it something that happens in days or weeks? What are the early signs of problems?

    Thanks!
    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

  7. Back To Top    #7

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    Re: How to measure high pH

    Following up to last year's posts above, I found the Taylor Technologies K-1285-6 Midget Comparator, pH (Cresol Red) http://www.taylortechnologies.com/pr...D=1&KitID=2207. Anyone have any experience with this? Seems to allow pH to be measured up to 8.6, which should be sufficient for my needs.
    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

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    duraleigh's Avatar
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    Re: How to measure high pH

    Seems to allow pH to be measured up to 8.6, which should be sufficient for my needs.
    I'm not really sure I understand. Why would you allow your pH to go above 8.0 before you lower it?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: How to measure high pH

    I don't check my pool daily as it doesn't get much use - usually once a week. I lower pH with MA but the spa spillover is always causing it to rise - I would like to know what number it settles at or if it continues to rise. I believe I can live with a slightly high pH if it plateaus - I want to be sure it isn't constantly going up. Thanks for any input on the test kit mentioned above or something better.
    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

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