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Thread: Citric Acid vs. Ascorbic Acid for Metal Stain Removal

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    Join Date
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    Citric Acid vs. Ascorbic Acid for Metal Stain Removal

    Since I'm having stain issues, I was wondering what other acid may be as effective as ascoribic acid, and maybe at lower cost.

    Sea Klear makes a stain remover called "Natural Stain Remover" where the main ingredient is Citric Acid. I have not tried it.

    I saw a couple of internet sources for cheap Citric Acid. I know there have been posts that say Oxalic Acid is more toxic than Ascorbic Acid, but I've been reading that both Citric and Ascorbic are weak acids. And, it does seem like Citric Acid is used as a food ingredient, so hopefully, it would not be harmful?

    I wonder if Citric acid would have the same Chlorine requirements, i.e. lower Cl to 0 before use and take Cl up slowly after treatment.

    Any comments on Citric Acid?
    10K IG fiberglass pool, Hayward 24" Sand Filter, 1.5HP Hayward superpump, Heat Pump Heater

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    JasonLion's Avatar
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    Re: Citric Acid vs. Ascorbic Acid for Metal Stain Removal

    Ascorbic acid isn't all that expensive. I have seen it for $12 per lb at places like this one.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Citric Acid vs. Ascorbic Acid for Metal Stain Removal

    Actually, all three of them (citric, ascorbic, oxalic) would deplete the chlorine. It's not their 'acidity' that makes them stain removers, it's the fact that all three of these are reducing agents (you might know them as 'anti-oxidants). They chemically 'reduce' the colored metal stain into a non colored, soluable metal ion that the sequesterant you add can then 'deactivate'.

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    Re: Citric Acid vs. Ascorbic Acid for Metal Stain Removal

    5 lbs for $13.47 + $10/ship - a bit cheaper than ascorbic: http://www.bulkfoods.com/search_resu...hParamTxt=4272

    Safe as ascoribic for the pool?

    As effective?
    10K IG fiberglass pool, Hayward 24" Sand Filter, 1.5HP Hayward superpump, Heat Pump Heater

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