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Thread: Soda Ash substitute

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    Soda Ash substitute

    Can I use sodium hydroxide in lieu of soda ash?
    Laura
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    Mod Squad JVTrain's Avatar
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    Re: Soda Ash substitute

    You sure can. Just be careful handling it. Pool Math does not have an automatic calculation for sodium hydroxide but you can get an estimate of how much to add using the Effects of adding chemicals section at the bottom of the page. It's listed there as "caustic soda" which is another name for sodium hydroxide or lye. Be sure to enter your actual pool volume at the top of the page before using the Effects section.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Mod Squad YippeeSkippy's Avatar
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    Re: Soda Ash substitute

    How about Borax (Sodium borate) ?
    Are you trying to raise your pH?
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    Re: Soda Ash substitute

    Great..thanks for your help
    Laura
    Baltimore MD
    IG pool 25,000 gallons
    Cartridge filter
    Plaster pool

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    Patrick_B's Avatar
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    Re: Soda Ash substitute

    I'll emphasize care in handling of it. Liquid NaOH can hurt you very quickly, especially if it makes contact with your eyes.
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    Mod Squad JVTrain's Avatar
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    Re: Soda Ash substitute

    Quote Originally Posted by Patrick_B View Post
    I'll emphasize care in handling of it. Liquid NaOH can hurt you very quickly, especially if it makes contact with your eyes.
    +1 I find it more hazardous than handling muriatic acid. The dry form that's usually only found in laboratories is even worse as it's very hygroscopic and generates lots of heat on contact with water.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    Re: Soda Ash substitute

    If you want a direct substitute for soda ash (sodium carbonate), it is Arm & Hammer Super Washing Soda (careful: NOT the laundry detergent).

    20 Mule Team Borax raises the pH with about half the rise in TA compared to sodium carbonate. Lye (caustic soda) is more pure and doesn't increase borates. Aeration raises the pH with no change in TA.
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