Regal Chemicals 30-60088-01 1L Stain Protect contains active ingredients that are 66% naturally derived. The Stain Protect base conditioner in actives and precipitates minerals and metals in pool water. Used on a regular basis, Stain Protect also prevents corrosion of the pool equipment. In addition, Stain Protect eliminates and prevents scale build-up on pool surfaces. Safe, bathing can resume immediately after the addition of Stain Protect. Its fully biodegradable formula also makes Stain Protect safer for the environment and will not add phosphates to the water.