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Thread: Can't get my PH to go down (Update)

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    Can't get my PH to go down (Update)

    I am trying to get my PH down before I shock and I can't seem to do it. Does MA get stale after some time? I am using some leftover from the previous owner. There is still fumes coming out of the bottle and it still stings when some of them gets in my eyes

    Here are my numbers.

    FC 0
    CC 0
    PH 8.2
    TA 90
    CYA 80
    CH 225

    I added 16oz(Pool Calculator) of MA 2 nights in a row and the PH has not dropped at all.

    Thanks

    Justin
    10400 Gallons, 21' Round, Above Ground, Vinyl
    Sand Filter

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    Richard320's Avatar
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    Re: Can't get my PH do go down

    Acid doesn't generally lose strength.

    The problem as I see it is that the pH tester stops at 8.2. Anything above that will read as 8.2. So who knows where you were really at when you began? Another problem is that the Pool Calculator isn't good for massive adjustments. Plug in your numbers, add what it says, brush a little to mix it up and let it circulate for 15 or 20 minutes, then test again and repeat.

    Have faith - it will come down. When I fired my pool guy it took me a ten pound bucket of dry acid and a gallon of MA to move the pH to the center of the test block! And some fine tuning after that.
    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: Can't get my PH do go down

    I'll just second richard - your PH could be 9 for all we know. Add some more, mix, retest.

    Noticed your FC at 0. Dont let your pool sit without chlorine for any period of time or you'll be posting in the Algae section next.

    Good luck.
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    Re: Can't get my PH do go down

    Richard... Wow! That's a lot of acid! Can't imagine what that pool water felt like on the eyes before you fixed it. Ouch!
    Indiana, ABG 24'x52" Galveston by Blue Cascade (Craigslist buy w/part of deck included), 13,500 gallons, Intex SWG, solar panels mix 2, TF-100 test kit.

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    Re: Can't get my PH do go down

    Thanks Richard for the info. I guess I'll make the trip to the USA a little earlier to get my test kit as the pool store people start to know me by my first name since I get my water tested daily with them.

    Lightingguy: My FC has been at 0 for the past 2 weeks(supprised that no algea has developped). Pool store kept on saying to "shock"(1/2 pouch of shock every 2 days) but it would not work. Then I was referred to the school section on this site and I have been trying to get my PH down before starting to shock it. It is really a pain to run to the store every single time to get my water tested and I don't want to spend $15 on strips when I am planning to get a kit that will do more.

    Thanks again for everyone's help.
    10400 Gallons, 21' Round, Above Ground, Vinyl
    Sand Filter

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    Re: Can't get my PH do go down

    It's fine to wait to shock until your PH is down - but I would still get SOME chlorine in there. I think you are lucky that algae hasn't taken hold of the pool - perhaps the water is cold?

    There's no reason not to get at least 8ppm FC in there and maintain it (based on your CYA). Do you feel you need to shock other than the pool store?
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    Re: Can't get my PH do go down

    Quote Originally Posted by lightingguy
    It's fine to wait to shock until your PH is down - but I would still get SOME chlorine in there. I think you are lucky that algae hasn't taken hold of the pool - perhaps the water is cold?

    There's no reason not to get at least 8ppm FC in there and maintain it (based on your CYA). Do you feel you need to shock other than the pool store?
    The water temp has been averaging at about 84. I was suggested to shock it by the pool store and the "How to shock" in the Pool School since the chlorine I have been putting in keeps getting back to zero even after large quantity.

    From the pool school:

    " If you have algae, or the CC level is above 0.5, or the free chlorine (FC) level is zero, you should shock the pool."

    Any advices are welcome.

    Justin
    10400 Gallons, 21' Round, Above Ground, Vinyl
    Sand Filter

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    Re: Can't get my PH do go down

    If you're using test strips, then your FC might be high and bleaching out the strips, which would read as zero. High FC will also cause a false high pH reading. You could try an OTO chlorine test kit to see what that shows. The OTO is the cheap test kit that is sold anywhere pool supplies are sold. OTO does not bleach out.You need to get an FAS-DPD test kit to really know what your chemistry is.

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    Re: Can't get my PH do go down

    As to your initial question, there may be some degradation in the strength of the MA over time. If you have any doubts and want to trust your calculations and results, I would buy some fresh, full strength MA and use that instead of the older chemical. You could always use it at a later time once your chemistry is balanced. Also, I would avoid using the "eye-burn" test to determine acid strength. You only have two eyes and MA is cheap.
    20K inground gunite w/ Aqua Logic automation and chlorination Sta-Rite 400 K natural gas heater and cartridge filter 2 HP pump 1.5 HP spa bubbler for spillover spa 1 HP dedicated Letro Legend cleaner
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    Re: Can't get my PH do go down

    JamesW: I am not using the test strips. The pool Store does my tests and I have some OTO Chlorine tests that shows my low level of chlorine. I am in the works of getting the TF-100 kit but it is a little complicated because of my location.

    Flintstone: I will try some new MA. This eye-burn test is not ideal .

    I think I wll keep adding some chlorine(algea prevention) and some MA to see if my PH will go down. I think I might be higher than 8.2 but the test from the pool store can't read higher than that.

    Thanks again.

    And to everyone for their help.
    10400 Gallons, 21' Round, Above Ground, Vinyl
    Sand Filter

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    JasonLion's Avatar
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    Re: Can't get my PH do go down

    MA almost never loses strength over time. It can last for years and years without any degradation.
    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

  12. Back To Top    #12

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    (Update) Can't get my PH do go down

    So last afternoon getting home, I added 500ml of MA, added 3" of water. Swam in it for the evening and added another 500ml of MA.

    This mornings test

    FC 0
    CC 0
    PH 6.4
    TA 40
    CYA 50
    CH 225

    I confirmed with the pool store that their max level of PH reading was 8.2. I suppose this why I had been putting MA to bring it from 8.2 to 7.5 and it was not dropping. I guess my PH was around 9 or so. Now, I guess I overcompensated with the MA. I'll also get my tap water tested next week to find out what will it do when I add some to my pool when I top up. Now to put some Baking soda to bring the TA and PH up.

    I can't wait to get my TF-100.
    10400 Gallons, 21' Round, Above Ground, Vinyl
    Sand Filter

  13. Back To Top    #13

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    Re: Can't get my PH to go down (Update)

    You may have been getting some bad data from the pool store.

    6.4 is way too low for PH you should get it up to at least 7 soon.

    The PH test is pretty common and cheap - it's just the little red dropper test. It's probably worth grabbing one so you can self test your water while you sort out the TF-100/Canada issue
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    Richard320's Avatar
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    Re: (Update) Can't get my PH do go down

    Quote Originally Posted by grosbiz
    So last afternoon getting home, I added 500ml of MA, added 3" of water. Swam in it for the evening and added another 500ml of MA.

    This mornings test

    FC 0
    CC 0
    PH 6.4
    TA 40
    CYA 50
    CH 225

    I confirmed with the pool store that their max level of PH reading was 8.2. I suppose this why I had been putting MA to bring it from 8.2 to 7.5 and it was not dropping. I guess my PH was around 9 or so. Now, I guess I overcompensated with the MA. I'll also get my tap water tested next week to find out what will it do when I add some to my pool when I top up. Now to put some Baking soda to bring the TA and PH up.

    I can't wait to get my TF-100.
    It is ordered, right?

    You'll be chasing your tail to the tune of ka-ching until you start testing yourself.
    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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