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Thread: Just switched to SWG. PH is high and won't come down

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    Just switched to SWG. PH is high and won't come down

    Just bought a aqua trol for my 32x16 aboveground. It works great and I'm still tuning it in. Ive been checking my water every day and adding Muratic acid to lower ph using the pool calculator to calculate the amount. My pool water is very hot. 90 degrees (south Louisiana) anyone have an idea why my ph is staying so high even though i am adding the acid? Thanks in advance.

    FC - 6.0 running SWG less time til i get it right
    CC - .5
    TC - 6.5
    PH - 8.2
    TA - 150
    CYA - 70
    Salt is at 3400
    Temp is 90. We need some rain to cool it down.

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    Re: Just switched to SWG. PH is high and won't come down

    Welcome, I see it's your first post. Being that you are new to posting here, I have to ask, "What did you use to test with?".

    Are you using bi-sulfate or Muriatic acid?

    How old is the acid?

    How much and how frequently have you been adding?

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Just switched to SWG. PH is high and won't come down

    muriatic acid AFAIK has an infinite shelf life

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    Re: Just switched to SWG. PH is high and won't come down

    Your TA is very high for a SWCG. Its' probably a bit high even for a non-SWCG pool, too. In a nut shell, without going into the nitty gritty, SWCG puts upward pressure on the pH. So..the recommended mitigation for this is to run a lower TA. The recommened level for a SWCG pool is between 70-80 ppm.
    Lowering the TA is a process, not a one time event. The idea here is to lower the pH with muriatic acid to around 7.2. The acid addition will lower the TA as well. You wolud then need to aerate the water to increase the pH without adding any chemical to bring the pH back up. Once the pH is back up to 7.5-7.6, add acid again and repeat the process until the TA is where you need it. I've never had to do it so i do not have good advice on what to rig up to aerate the pool. Someone will be along soon, i'm sure, to give you advice on that.

    Since you are new, read through pool school, it will help a lot!
    pool-school/
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

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    Re: Just switched to SWG. PH is high and won't come down

    SWG tend to raise pH. I am guessing your pH is coming down, but was so high it was off the charts to begin with. Has your TA been going down?
    South Florida. 20,000 gallons; 16x35 rectangular gunite; Pentair Intelliflo VF Variable Speed Pump; Hayward cartridge; Aqua Rite SWG. Dolphin Oasis Z5 Robotic Pool Cleaner; Kopec 540sc Electric Heat pump pool heater; Pool built in Spring 2004.

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    JasonLion's Avatar
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    Re: Just switched to SWG. PH is high and won't come down

    I'm with bk406, you need to lower your TA level.
    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

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    Re: Just switched to SWG. PH is high and won't come down

    I am using the TF-100 to test. I am using muriatic acid. Is there a way to lower the TA besides acid? I have added more acid and will run another test on the water tonight to see if the TA and/or Ph is coming down. Thanks again all!

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    poolgirl22's Avatar
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    Re: Just switched to SWG. PH is high and won't come down

    Nope. Every time that ph comes up to 7.8, add enough to bring ph down to 7.2. It may take some time. As you lower the TA it should slow the drift. It took WEEKS to get mine down.
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump
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    dmanb2b's Avatar
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    Re: Just switched to SWG. PH is high and won't come down

    I reduced my TA last year from somewhere around 350 to 70 using 8 gals of Muratic Acid and this over a period of 3 days.

    Lower your TA as mentioned above...the process is described here
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Just switched to SWG. PH is high and won't come down

    My fill water is over the top with a TA of over 350....

    I've almost made this a weekly routine. Factor in I have a SWG and when we have a dry spell I have to add TA >350 fill water for evaporation compensations, my TA goes up quickly.
    South Florida. 20,000 gallons; 16x35 rectangular gunite; Pentair Intelliflo VF Variable Speed Pump; Hayward cartridge; Aqua Rite SWG. Dolphin Oasis Z5 Robotic Pool Cleaner; Kopec 540sc Electric Heat pump pool heater; Pool built in Spring 2004.

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    JasonLion's Avatar
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    Re: Just switched to SWG. PH is high and won't come down

    You might want to consider an automated acid feeder.
    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

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