Pool blok, 5.75" x 2.875" x 2.87", pool & spa cleaner brick, a pure pumice scouring stone cut & sized for spot, surface & underwater cleaning of recreational swimming pools & spas, spot cleaner for rust marks, algae or leaf stains, pool blok quickly shapes to any surface, concrete, masonry & hard metal surfaces.

• Pool Blok quickly shapes to any surface
• Cleans even when the strongest acid chemicals have failed
• A pure pumice scouring stone cut and sized for spot, surface and underwater cleaning of recreational swimming pools and spas
• Ideal as a spot cleaner for rust marks, algae or leaf stains