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Thread: What is the least expensive acid additive?

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    What is the least expensive acid additive?

    My pool CONTANTLY needs acid to keep the pH in normal range. Just put in 2 gallons of muriatic acid that cost $11.00 two days ago and the pH is back up to 7.8 today. Is there a less expensive way to drop th pH?
    Built in 1986, 40,000 gallon, IG, gunite, well water, 200 sq ft PacFac Clean and Clear, 1.5hp pump, attached spa

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    JasonLion's Avatar
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    Re: What is the least expensive acid additive?

    Welcome to TFP!

    Muriatic acid is almost always the least expensive by a wide margin. That is about the going price for 31% muriatic acid, though I have seen it for just a little less than that occasionally.

    How do you end up needing to use so much acid? We might be able to help you adjust things so you don't need to use as much, though there are some situations, like fresh plaster, where there is no avoiding it.
    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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    Mod Squad JohnT's Avatar
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    Re: What is the least expensive acid additive?

    I find MA price varies quite a bit. I can find it for $3.89 a gallon at a farm store, but hardware stores usually run $6.99 or more.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: What is the least expensive acid additive?

    What do your TA numbers look like?
    18x36 Vinyl In-ground w/roman ends 27,400G, Hayward 3/4hp with 300# sand filter. Hayward heat pump heater

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    Re: What is the least expensive acid additive?

    Total Alkalinity is VERY high at 130. The pool chemical place intown says that only way to deal with that is to add MA. Perhaps I should be looking at cost effective alternatives to reducing TA rather than to reduce pH? We are on well water so that may have something to do with the weird readings of our pool water. Water coming into the house goes through multile steps of softening and filtering but the pool water comes directly from the well.
    Results from the modt recent pool water test are:
    FC=5
    TAC=5
    Cya=100
    TA=130
    pH=7.8
    Copper=0
    Iron=0
    Total Dissolved Solids=900
    Phosphates=200
    Pool is green even with daily vacuum/scrub of pool walls and bottom and rinse of filter every 12 hours. The algae thinks this is really fun that they have stumped me.
    Built in 1986, 40,000 gallon, IG, gunite, well water, 200 sq ft PacFac Clean and Clear, 1.5hp pump, attached spa

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    Mod Squad JohnT's Avatar
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    Re: What is the least expensive acid additive?

    for CYA of 100, you don't have nearly enough chlorine. Lowering alkalinity requires MA, but the pool store method won't work. You have to use it to drop your pH to around 7 and keep it down there routinely while aerating the water.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    JasonLion's Avatar
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    Re: What is the least expensive acid additive?

    You need to lower CYA down to something reasonable (50 or 60) and then shock the pool. One thing to watch out for is that the common CYA test will report any CYA level over 100 as 100, so your CYA level might actually be much higher. With CYA that high it takes really extreme amounts of chlorine to fight algae, so much that it becomes completely impractical.

    There are full instructions on lowering TA, which will stop the PH from rising, in Pool School.
    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: What is the least expensive acid additive?

    Thanks to all, I will re-do Pool School to see how I can lower CYA and TA; I had been so focused on just pH..... Thanks for all your time and input!
    Built in 1986, 40,000 gallon, IG, gunite, well water, 200 sq ft PacFac Clean and Clear, 1.5hp pump, attached spa

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