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Thread: 15 month old pool using 48 - 62 oz of acid a week

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    15 month old pool using 48 - 62 oz of acid a week

    Acid consumption seems high now that plaster (quartzscape) is a year old. Thought I'd post here to confirm.

    Yesterday's numbers:
    FC 4
    CC .5
    pH 7.9 (prior to adding 32 oz of acid I shoot for 7.5)
    TA 100
    CH 400
    CYA 70


    SUMMER 2015 BUILD IG gunite 38 x 31, 28,000 gal, 110' perimeter, Intelliflo VS, Whisperflow 3hp, Intellibrite LED x2, Clean & Clear 520, Screen Logic, Intelichlor 40, Quartzscape Blue, K-2006C, Speedstir, Aquanaut 400 (4 wheel The Pool Cleaner)

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    Texas Splash's Avatar
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    Re: 15 month old pool using 48 - 62 oz of acid a week

    First thing I would try is lowering that TA a bit by following the TFP Pool School - Lower Total Alkalinity page. Shoot for a new TA target of 70 or so and see how well that helps. If you have any products that generate aeration (waterfall, bubblers, etc) that can be adjusted lower that may help 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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    Re: 15 month old pool using 48 - 62 oz of acid a week

    Thanks, I'll give it a shot.


    SUMMER 2015 BUILD IG gunite 38 x 31, 28,000 gal, 110' perimeter, Intelliflo VS, Whisperflow 3hp, Intellibrite LED x2, Clean & Clear 520, Screen Logic, Intelichlor 40, Quartzscape Blue, K-2006C, Speedstir, Aquanaut 400 (4 wheel The Pool Cleaner)

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    Re: 15 month old pool using 48 - 62 oz of acid a week

    Quote Originally Posted by Texas Splash View Post
    First thing I would try is lowering that TA a bit by following the TFP Pool School - Lower Total Alkalinity page. Shoot for a new TA target of 70 or so and see how well that helps. If you have any products that generate aeration (waterfall, bubblers, etc) that can be adjusted lower that may help as well.
    Started this today. Any idea how long I should run my water features after I take pH down to 7? I understand it varies, just looking for ballpark. I have two water pots and one 48" sheer decent. I was thinking I'd run it for 1.5 hours and then check pH and TA.
    SUMMER 2015 BUILD IG gunite 38 x 31, 28,000 gal, 110' perimeter, Intelliflo VS, Whisperflow 3hp, Intellibrite LED x2, Clean & Clear 520, Screen Logic, Intelichlor 40, Quartzscape Blue, K-2006C, Speedstir, Aquanaut 400 (4 wheel The Pool Cleaner)

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    Texas Splash's Avatar
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    Re: 15 month old pool using 48 - 62 oz of acid a week

    That's what I would do. Run the sheer and check a couple hours later. After doing that a couple times you should begin to see a pattern of how aeration increases your pH.
    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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    Re: 15 month old pool using 48 - 62 oz of acid a week

    Quote Originally Posted by Texas Splash View Post
    That's what I would do. Run the sheer and check a couple hours later. After doing that a couple times you should begin to see a pattern of how aeration increases your pH.
    Took pH down to 7.2 (actually was probably 7.1) and it lowered TA to 70. Ran water features for 2 hr and it brought pH back-up to 7.4 so all looks good pH and TA wise, HOWEVER, now my CSI is -.45 "Potential to become corrosive to plaster" so now what?

    According to Pool Math I need to take my pH back-up to 7.6 to to balanced. Suggestions? Do I take my pH to high end of what is recommended? Wait for it to rise naturally?

    Here are today's numbers:
    CSI - -.45
    FC - 4.5
    CC - .5
    pH - 7.4
    TA - 70
    CH 400
    SUMMER 2015 BUILD IG gunite 38 x 31, 28,000 gal, 110' perimeter, Intelliflo VS, Whisperflow 3hp, Intellibrite LED x2, Clean & Clear 520, Screen Logic, Intelichlor 40, Quartzscape Blue, K-2006C, Speedstir, Aquanaut 400 (4 wheel The Pool Cleaner)

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    Re: 15 month old pool using 48 - 62 oz of acid a week

    Your CSI is always going to dip temporarily when you are trying to lower TA because you are getting that pH below range. It is OK for short periods of time. Once you get things balanced you will be good to go.
    13k Gallon IG Pebble w/ attached Spa, AquaRite T-Cell-15 SWG, Hayward DE6020 Filter, Hayward 2 HP Pump, Hayward 400k Heater, TF-100 Kit, Pool Logger

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    Texas Splash's Avatar
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    Re: 15 month old pool using 48 - 62 oz of acid a week

    Humm. Something's not adding-up right. When I use the Poolmath calculator for your 28K pool, and use 7.4, 70, and 400 as my numbers, I get a CSI of "-0.18". You might want to verify on your end 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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: 15 month old pool using 48 - 62 oz of acid a week

    Quote Originally Posted by Texas Splash View Post
    Humm. Something's not adding-up right. When I use the Poolmath calculator for your 28K pool, and use 7.4, 70, and 400 as my numbers, I get a CSI of "-0.18". You might want to verify on your end as well.
    Hmmmm, maybe a data entry error. I'll look at it when I'm home tomorrow. Thanks for pointing this out!
    SUMMER 2015 BUILD IG gunite 38 x 31, 28,000 gal, 110' perimeter, Intelliflo VS, Whisperflow 3hp, Intellibrite LED x2, Clean & Clear 520, Screen Logic, Intelichlor 40, Quartzscape Blue, K-2006C, Speedstir, Aquanaut 400 (4 wheel The Pool Cleaner)

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    Re: 15 month old pool using 48 - 62 oz of acid a week

    Quote Originally Posted by Texas Splash View Post
    Humm. Something's not adding-up right. When I use the Poolmath calculator for your 28K pool, and use 7.4, 70, and 400 as my numbers, I get a CSI of "-0.18". You might want to verify on your end as well.
    Quote Originally Posted by QingGuy View Post
    Hmmmm, maybe a data entry error. I'll look at it when I'm home tomorrow. Thanks for pointing this out!
    TS,

    You're not accounting for salt. When you add 3600ppm (average for his SWG), you get the correct CSI that QingGuy quotes.

    QingGuy,

    Now that you lowered TA, allow your pH to drift up to 7.6-7.8 and hold it in that range. Do not add any acid until your pH rises above 7.8 and only lower it down to 7.6. See what your acid addition frequency is.

    Also, can you post test results for your fill water? That's important too.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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