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Thread: Trouble with alklinity

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    Trouble with alklinity

    Getting frustrated. Background 20,000 gallon salt water fiberglass pool covered. I've got it pretty good, ph 7.5, hardness 300, cyn 35 BUT Alkalinity 150. So I tried to lower alkalinity by adding muriatic acid. Then upping the ph. I was using sodium carbonate but was told by local store it would also raise alkilinty at the same rate so switched to soda ash. More muriatic acid and alkalinity got down to 100 and ph 6.8. So in with soda ash.
    Now ph back to 7.4 but alkalinity back up to about 180.
    I'm at a loss as to how to lower alkalinity to get it in line with ph.
    Any advise?
    Thanks

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    Azgirl71's Avatar
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    Re: Trouble with alklinity

    Welcome to TFP! It is actually a process. You cannot just add MA once. You have to do it over several weeks. Here is a link that shows the process I have been going through. You can see it has been a long process.

    Results after SLAM

    Pool School - Lower Total Alkalinity
    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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    Re: Trouble with alklinity

    The only way to raise the pH without raising the alkalinity with it is trough aeration.

    Lower the pH to 7-7.2 and aerate to 7.4-7.5 and repeat...
    -Brian-
    33K Pool/Spa, Pentair Equipment
    POOL BUILD
    Davis Custom Construction - Home Page

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    Re: Trouble with alklinity

    So if I leave the cover open and run the 6 fountains (5' arcs plumbed from the return lines located on the deck) for a few hours each day will raise the ph. Then lower both ph and alkalinity with acid and repeat until my desired level.
    How long should i let the fountains run each day?

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    Re: Trouble with alklinity

    That is correct.

    It all depends on how quickly you are trying to lower your alkalinity. The more you run them, the more pH rise you will get. Your pH will rise much quicker at a pH of 7 as opposed to a pH of 7.6
    -Brian-
    33K Pool/Spa, Pentair Equipment
    POOL BUILD
    Davis Custom Construction - Home Page

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    Re: Trouble with alklinity

    Thanks I will start tomorrow and keep you appraised of my progress.
    Steve

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    Scuba_Steve's Avatar
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    Re: Trouble with alklinity

    It is a slow process though so just be warned. Do not expect results in a few days. It takes me roughly 3 days to go from 7.0 to 7.3 and I seem to be losing about 4-6 ppm of TA each time I relower.
    6425g Intex Ultraframe 18'x48" AG
    Stock 1500gph cartridge filter / Intex SWG CG-28669 with E.C.O.
    Install date: 5/26/2015
    TF-100
    Helpful Links

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    Re: Trouble with alklinity

    Update after a week, I've been aerating the surface with my fountains for about 8 hours a day. When the ph gets to about 7.6 I add MA and it drops to about 7.0. I've done this 3 times over the last week. No other water or chemicals have been added. Meanwhile the TA went to 210, I attribute this to the water settling after adding the soda ash last week. today the TA has slowly dropped to 180.
    Is this the typical time frame I should expect?
    Thanks,
    Steve

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    Azgirl71's Avatar
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    Re: Trouble with alklinity

    I takes a few weeks sometimes longer.
    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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