Stainfree is an ascorbic acid product, similar to those big chewable Vitamin C tablets you get from the drugstore. The Stainfree product from Natural Chemistry 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. On the plus side, Stainfree does not create any residual phosphates in your pool water, making it an excellent stain fighter without adding food for algae.
the cheat here of course being that you can use some of those Vitamin C tablets to scrub at the yellow/brown stains...if the tablet removes the stain, then the Strainfree will work on your pool stains.
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