5 Things to Know About Using Ascorbic Acid for Pool Stains

Ascorbic acid is the standard fix for iron and copper stains on pool plaster or vinyl. It works quickly and effectively on most metal stains.

Lower the pool pH to around 7.0 before applying the treatment. This ensures the ascorbic acid reacts properly with the stains.

Broadcast the ascorbic acid directly over the stain area. You will see the stain fade or disappear within minutes of application.

Stubborn copper stains may require a follow-up treatment. Use a stain-removing sequestrant like Metal-Free after the ascorbic acid.

This method works for most metal stains but not all. Test a small area first to confirm it will work on your specific stain type.