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Natural Pumice Stone is great for cleaning Tile & Concrete. It removes Lime, Rust, Stains and Algae. It Floats! No need to drain pool. Pool Blok is chemically neutral. Works fast as a surface lime remover. Cleans even when the strongest acis chemicals have failed. Ideal as a spot cleaner for rust marks, algae or leaf stains. Pool Blok quickly shapes to any surface. Wet, then rub stained or scaled surface until clean. Rinse surface. Effective when used with water or acid.