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Thread: Adjust pH or Alkalinity?

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    Adjust pH or Alkalinity?

    Opened pool to swamp.

    FC: 0-1
    CC: 0
    pH: 8.2+
    TA: 60
    CYA: 0

    Do I add Muriatic Acid to drop pH or first adjust TA up to 110 by adding baking soda? Or should I do both?

    Also, need to add CYA and chlorine. Can I do all at the same time or there a recommended order?

    Thanks
    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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    Mod Squad pooldv's Avatar
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    Re: Adjust pH or Alkalinity?

    Just lower PH. Why are you targeting TA of 110? That is too high. Here is what we recommend, Pool School - Recommended Levels
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    Mod Squad jblizzle's Avatar
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    Re: Adjust pH or Alkalinity?

    I agree with the above. But I just wanted to add that you can add the cya in a sock and get it dissolving at the same time it is in fact slightly acidic so will help lower the ph some.
    Jason, TFP Moderator
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    Re: Adjust pH or Alkalinity?

    Thanks. Good thing I asked. I think the instructions that come (laminated sheet) with the TF-100 say recommended TA is 100-120. But I see that you recommend 50-90+ , which means I am in range. So will add the CYA in sock and lower pH, then shock.

    Good thing I asked.
    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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    Mod Squad jblizzle's Avatar
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    Re: Adjust pH or Alkalinity?

    No shock... you need to follow the SLAM process
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Mod Squad pooldv's Avatar
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    Re: Adjust pH or Alkalinity?

    Yes, over time we have lowered our TA recommendations quite a bit.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Adjust pH or Alkalinity?

    So I got Muriatic Acid from Home Depot, it is only 20%. I added 64 oz. (full dose according to Pool Math) about 3.5 hours ago. Retested the pH now and still reading 8.2.

    1) Could it be that the pH was so much higher than 8.2 and the acid has worked to lower it but need to add another bottle?

    2) Is there any downside to adding too much MA?

    Thanks
    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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    Mod Squad jblizzle's Avatar
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    Re: Adjust pH or Alkalinity?

    There is only a downside to adding MA if you add too much and the pH gets too low. Likely your pH was just much higher.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Adjust pH or Alkalinity?

    So added more MA and thought I followed PoolMath recommendations but, on last test, reading is 6.8 and could be lower. Now what?

    I really want to start the SLAM. I read somewhere that pH rises during SLAM anyway. So can I just go ahead and wait to balance the pH until SLAM is over or must I add Borax (or Baking Soda??) now to get to 7.2? What could go wrong if I SLAM with a low pH?

    This is the greatest site!!
    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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    Mod Squad jblizzle's Avatar
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    Re: Adjust pH or Alkalinity?

    You should raise the pH back up in the 7s, because you do not know how low it really is. Use borax or washing soda, NOT baking soda.

    Low pH could damage your liner or pool equipment (especially your heater).
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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