SeaKlear® Metal Stain Remover works effectively to remove stains caused by excess metals in pool water. The granular formula is effective for the removal of iron, copper and manganese staining. These stains may appear as brown, grey, turquoise or black stains. Metal Stain Remover should be used first if stains are already present. For metal stain control and prevention use SeaKlear® Metal Klear or SeaKlear® Stain Prevention & Remover weekly. For systems with salt generators, use SeaKlear® Metal Klear. To keep pool water crystal clear, use SeaKlear® Chitosan Clarifier weekly.