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Thread: Alkalinity Question

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    Alkalinity Question

    I have been monitoring my pool water everyday with an approved testing kit and the PH of my pool has been sitting steady at 7.4 for the last three days which is fine, but my total alkalinity has continued to rise everyday. My last three readings are 151, 155, 167. I know looking through this website it says to not worry about lowering the TA just to reach a target number and only lower if you have the risk for scaling or the PH is rising. I have neither of these problems at the moment and since I have a vinyl lined above ground pool, do I need to worry about any of this? I'm nervous the high number is going to cause an unwanted issue for me. I know low total alkalinity can be bad, but what about high in my situation? Any help and information would be appreciated. Thanks.
    16 X 24 Kayak Above Ground Pool; Vinyl Lined; 12,000 gal; Hayward 1 hp pump; Pentair Sand Dollar Sand Filter

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    Mod Squad JohnT's Avatar
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    Re: Alkalinity Question

    TA generally isn't going to rise quickly without a pH increase or the addition of high TA replacement water. I suspect your pH has crept up just a hair that can't be easily measured, and between that and the accuracy of the test you really aren't seeing much if any change in TA.

    Don't worry about it. If your pH is relatively steady, you can start testing TA weekly and just concentrate on pH and chlorine on your daily tests
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Alkalinity Question

    Thank you. My PH has been relatively steady and I've only had to add chlorine every 2-3 days so everything is going good with the pool. I just see that higher than normal number and get nervous. I don't want to damage my pool, equipment, or mess my water chemistry up badly. This site has made it much easier and less stressful to manage my pool.
    16 X 24 Kayak Above Ground Pool; Vinyl Lined; 12,000 gal; Hayward 1 hp pump; Pentair Sand Dollar Sand Filter

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    Richard320's Avatar
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    Re: Alkalinity Question

    Those numbers look like a LaMotte?

    I'm not familiar with them, but they're not so far apart that I would suspect anything more sinister than the margin of error.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Alkalinity Question

    Yes it is Richard. It's a Lamotte Color Q 7 Pro 2056 test kit. I really like it and it probably is just the error margin. You guys don't seem too concerned over my numbers so I'm not going to stress over them either.
    16 X 24 Kayak Above Ground Pool; Vinyl Lined; 12,000 gal; Hayward 1 hp pump; Pentair Sand Dollar Sand Filter

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    Re: Alkalinity Question

    Yeah, your numbers are fine. The LaMotte may report those numbers to you but it has nowhere near that precision. + or - 10 ppm on a good day is about the best you can expect. Even then, that is just fine for the type of TA control that we monitor.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Alkalinity Question

    Good to know. Thanks for all the help. I was not really accounting for error margin + and - and that would explain a lot. Makes me feel better about things. You guys have eliminated my need to depend on the pool store and I'm flying solo for the first time on my own and loving it. Thanks.
    16 X 24 Kayak Above Ground Pool; Vinyl Lined; 12,000 gal; Hayward 1 hp pump; Pentair Sand Dollar Sand Filter

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