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Thread: Using Citric Acid for Stain Removal

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    In the Industry

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    Using Citric Acid for Stain Removal

    I have been in the industry for about six years and just recently heard of using straight citric acid to remove stains on pool surfaces. I have spoken with multiple people who say that it works well, but obviously have no personal experience with the product. I would like to know the procedure for doing so (i.e. parameters necessary for successful treatment, one dose or multiple, effects on water chemistry and equipment, and post-treatment procedures).

    Thank you.

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    Re: Using Citric Acid for Stain Removal

    I just pour it in there and it works right before my eyes. lol

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    Mod Squad JohnT's Avatar
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    Re: Using Citric Acid for Stain Removal

    Welcome to TFP.

    Here's a link to a description of the process: ascorbic-treatment-to-rid-pool-of-metal-stains-t2298.html
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    Re: Using Citric Acid for Stain Removal

    When using citric acid, instead of ascorbic acid, you need to use about 1.5 to 2 times as much.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Using Citric Acid for Stain Removal

    Quote Originally Posted by JohnT
    Welcome to TFP.

    Here's a link to a description of the process: ascorbic-treatment-to-rid-pool-of-metal-stains-t2298.html
    Thank you much...I don't plan on using the procedure myself, but nice to have the knowledge.

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    Re: Using Citric Acid for Stain Removal

    I have a salt water chlorine generator. Will the chlorine breakdown back into salt upon contact with citric acid or will I need to add more salt?

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    Re: Using Citric Acid for Stain Removal

    Quote Originally Posted by BJHswim
    I have a salt water chlorine generator. Will the chlorine breakdown back into salt upon contact with citric acid or will I need to add more salt?
    When you do a metal stain treatment, using ascorbic acid, citric acid, or any other reducing agent, you lower your chlorine level first. After the treatment, any chlorine you add, including that from an SWG, will react with any remaining ascorbic acid, citric acid, or other reducing agent. You do not need to add any more salt. When the chlorine reacts with the reducing agent, it turns back into chloride salt.
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