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Thread: pH keeps going up

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    pH keeps going up

    Hi all!

    I recently finished SLAMing the pool, but my pH keeps going up quite high every day. I read on TFP that it's due to the high TA. I started with TA 300 a few weeks ago, and now I'm down to 200.

    What level should I aim for? I've got a tiny AG pool - 5300 gal

    I had a pH of 8+ day before yesterday, but 2 doses of dry acid got it down to 7.2 last night. It's 7.8 right now (the pump was running all night because my husband forgot to turn it off).

    This morning's readings:
    pH 7.8
    CYA 40
    FC 16.5 (it was up to 20 during shocking process, just finished 2 days ago)
    CC 0
    TA 200

    We do not have a SWG right now.
    5300 gal, AG vinyl, .95HP 28651EG Intex Krystal Clear 3000 GPH Sand Filter Pump
    TF100 - test kit

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    Azgirl71's Avatar
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    Re: pH keeps going up

    Your ph won't be accurate with your FC above 10ppm.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Propbndr's Avatar
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    Re: pH keeps going up

    Recommended levels can be found here:

    http://www.troublefreepool.com/conte...mmended-levels

    PH readings can be inaccurate (reading high) when your FC is above 10. You may want to wait until the FC is 10 or less and test PH again before making any adjustments.

    (Azgirl beat me to the answer)
    Steve
    32 X 16 inground, 17260 gallons, Vinyl Liner, Triton II TR-60 filter,
    Sta-Rite 1hp pump Model #MPRA6E-147L, CircuPool SI-30 Plus SWG, TF-100 Test Kit

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    Patrick_B's Avatar
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    Re: pH keeps going up

    That is correct. The pH reading is invalid above FC 10 and up. Don't adjust or retest until it's below 10 FC.
    TFP Moderator
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    Mod Squad pooldv's Avatar
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    Re: pH keeps going up

    Here is a little more detailed info on saltwater balance. Water Balance for SWCGs
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    Re: pH keeps going up

    Oh wow.
    Thanks! I can't believe I forgot that.
    5300 gal, AG vinyl, .95HP 28651EG Intex Krystal Clear 3000 GPH Sand Filter Pump
    TF100 - test kit

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    Re: pH keeps going up

    Additional question: my pool is in direct sunlight all the time, so should I aim for a higher level of CYA? I read elsewhere that 60-70 might be better, even for a pool without a SWG
    5300 gal, AG vinyl, .95HP 28651EG Intex Krystal Clear 3000 GPH Sand Filter Pump
    TF100 - test kit

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    Mod Squad JVTrain's Avatar
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    Re: pH keeps going up

    At that high TA level, your pH will also rise faster than with a lower TA. Once you can reliably test pH at lower FC levels, just keep dropping the pH to 7.2 when it gets above 7.8 and eventually the pH rise will slow once TA gets to a lower level through the acid additions.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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    Patrick_B's Avatar
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    Re: pH keeps going up

    Quote Originally Posted by lucimireles6 View Post
    Additional question: my pool is in direct sunlight all the time, so should I aim for a higher level of CYA? I read elsewhere that 60-70 might be better, even for a pool without a SWG
    Try it no higher than 60 for a while and see how that does. You can always increase it.
    TFP Moderator
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    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
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    Re: pH keeps going up

    I will! Thanks for all your suggestions
    5300 gal, AG vinyl, .95HP 28651EG Intex Krystal Clear 3000 GPH Sand Filter Pump
    TF100 - test kit

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    Re: pH keeps going up

    Quote Originally Posted by JVTrain View Post
    At that high TA level, your pH will also rise faster than with a lower TA. Once you can reliably test pH at lower FC levels, just keep dropping the pH to 7.2 when it gets above 7.8 and eventually the pH rise will slow once TA gets to a lower level through the acid additions.
    I will do that. Thanks!
    5300 gal, AG vinyl, .95HP 28651EG Intex Krystal Clear 3000 GPH Sand Filter Pump
    TF100 - test kit

  12. Back To Top    #12

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    Re: pH keeps going up

    I turned the pump off this morning.
    The FC dropped to 11.5. Is that typical? That seems like a huge drop. The surface of the pool is pretty warm since the water wasn't circulating. Should I leave it running and turn the filter off?
    5300 gal, AG vinyl, .95HP 28651EG Intex Krystal Clear 3000 GPH Sand Filter Pump
    TF100 - test kit

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