Product description Natural Chemistry is an Citric acid based product, so it is a lot like Vitamin C for your pool. It is ideal for treating stains on vinyl pool liners and fiberglass pool surfaces. This all natural formula does not create any residual phosphates in your pool water. Dosage: 1 pound per 10,000 gallons From the Manufacturer Stain Free is an all-natural stain remover. It's like Vitamin C for your pool! Stain free is an ascorbic acid product, similar to everyday Vitamin C. It is ideal for treating staining to vinyl pool liners and fiberglass pool surfaces. A safe and people friendly alternative to harsh chemicals typically used to treat stains. The bonus is that Stain free does not create any residual phosphates in your pool water, making it the perfect stain-fighter for use with Natural Chemistry's PHOSfree program

• Use with Natural Chemistry's Metal-Free for the ultimate stain-fighting combination
• Citric acid product ideal for treating stains to vinyl liner and fiberglass pool surfaces
• Recommended Dosage is 1 pound per 10,000 gallons; does not create any residual phosphates in your pool water

Use with Natural Chemistry's Metal-Free for the ultimate stain-fighting combinationNatural Chemistry