Pool Blok PB-80 Tile & Concrete Pumice Cleaner Block, 6-1/2 Inch | 100% Natural Pumice Stone for Cleaning Pools, Spas & Water Features, Pool and Spa Cleaner, Removes Lime, Rust and Stains

US Pumice Stone Tile Concrete Cleaner PB-80 Cleans where chemicals fail. Removes lime, rust, stains and algae deposits from ceramic tile, molded and pneumatic formed concrete surface pools and spas. No need to drain pool. Chemically neutral. Won't upset pH balance. Works through abrasive action. Ready to use. No gloves or applicators needed. Sizes for spot, surface and under water cleaning. The pole adapter fits all standard telescopic poles. Safe for skin. Safe around children and pets.