Anhydrous Citric Acid - Rust-Oleum Concrete Etch

dclynds

Well-known member
Apr 29, 2016
79
Houston, TX
Pool Size
17500
Surface
Plaster
Chlorine
Liquid Chlorine
Hello TFPers,

I recently re-finished a concrete floor with a Rust-Oleum epoxy kit and it came with two 1-lb. bags of anhydrous citric acid for etching the concrete. Do you think I could use this product in lieu of ascorbic acid for removing metal stains? If so, would 2-lbs. be enough to treat 17,500 gallons?

Thanks,
Daniel
 

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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
18,476
Tucson, AZ
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
You can but probably not a good idea. It’s more acidic than AA (drops the pH more) and it forms chloroform when it reacts with chlorine which can be sickening and irritating at high enough levels.

Stick with AA. Save the citric acid for candy making.
 
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