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Thread: pH fluctuating

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    Join Date
    Jun 2016
    Location
    Jackson NJ
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    96

    pH fluctuating

    Pool water is clear and FC drops 3-4 ppm every 2 days.

    Lately we had a lot of rain and the jet was pointed up so I think the water was aerated.

    Either way, the pH has been fluctuating and testing is producing a range of results. TA was 120 for the longest time and is now shoing 90-100.

    Should I add baking soda to raise TA? Borax to raise pH (sometimes tests at 7.0, sometimes at 7.8).

    Last question: is CYA f 30 sufficient or should I make it higher.

    FC 2
    CC 0
    TA 90
    pH 7.6?
    CH 120
    CYA 30
    Vinyl IG 18x43 25,000 gallon
    Hayward Pro s244T 300 lb Sand (with occasional addition of clarifier)
    1.5 HP pump; Polaris 380 with booster pump; Hayward H400 gas heater
    TF-100 with SpeedSTIR

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    wjr75's Avatar
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    Jun 2013
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    IL
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    816

    Re: pH fluctuating

    Do not raise your TA as it is fine. Where you are at or slightly lower actually slows down ph rise. My pool likes a CYA at around 45ppm but your FC loss isn't too bad so it's up to you to raise it a little or not.
    Inground 22k gallon gunite 15x31 main pool, 15x7 wading pool/sunning deck, hot tub/with overflow (9' octagon with limestone top) & slide NSWG, Aqua Blue Pebble Sheen
    Filter dual cartridge Sta-rite 450sq/ft, TF-100 Test Kit
    Heater Raypak 2100 400k btu cupro-nickel exchanger
    Auto pool cover, Polaris 280 auto pool cleaner, Jandy AqualinkRS8 Remote Control System

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    Texas Splash's Avatar
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    Jun 2014
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    Re: pH fluctuating

    Don't raise TA at this time. Typically a higher TA allows pH to rise too fast. That's the most common issue. A TA of 80-100 is fine. Even if it was lower, even down to 60, that's okay as long as your pH is stable. PH doesn't normally bounce back & forth on its own unless chemicals or aeration are involved. So just watch pH more than anything and try to keep it in the 7.5-7.7. zone. If the pH is happy in one area, don't change the TA.

    A CYA of 30 is fine as long as your pool isn't losing too much FC, and from the looks of things your FC drop rate is very good (minimal). So I'd leave that alone as well.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Mod Squad pooldv's Avatar
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    Re: pH fluctuating

    Here is what you are looking for, Pool School - Recommended Levels
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  5. Back To Top    #5

    Join Date
    Jun 2016
    Location
    Jackson NJ
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    96

    Re: pH fluctuating

    Thanks everyone. And thank you for the good news. Glad I asked before acting.
    Vinyl IG 18x43 25,000 gallon
    Hayward Pro s244T 300 lb Sand (with occasional addition of clarifier)
    1.5 HP pump; Polaris 380 with booster pump; Hayward H400 gas heater
    TF-100 with SpeedSTIR

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