5 Things to Know About Using Citric Acid for Pool Rust Stains

Citric acid works on rust stains It effectively removes rust from concrete pool surfaces without the need for harsh muriatic acid on most stains.

Make a paste and scrub Mix citric acid powder with a little water to form a paste, scrub it into the stain with a stiff brush, let it sit for 10–15 minutes, then rinse.

Repeat if needed Stubborn stains may require a second application, but this is still safer than using stronger acids.

It’s safe for concrete Citric acid is mild enough that it won’t damage concrete or disrupt your pool chemistry the way muriatic acid can.

Rinse thoroughly Do not let the paste dry out completely, and rinse the area well before anyone swims.