Ascorb-X from N. Jonas is ascorbic acid that is specifically crafted to fight stains caused by organic materials. It helps treat and remove stubborn grey, yellow, and brown deposits. 1 lb. will treat up to 10,000 gallons.
It’s important that your pH and alkalinity are balanced before using Ascorb-X. For proper use, add to your pool water, and then run your pool pump for 48 hours while brushing periodically then backwash your filter. For localized deposits such as staining on your stairs, you can add this product directly to the problem site.