PoolStone Cleaning Block, Environmentally friendly cleaning blocks provide powerful, effective, and safe cleaning for pools and spas, cleans tile, grout, concrete, and gunite. PoolStone removes hard water stains, rust, mineral build-up, mold, and mildew stains.
Made in New Mexico, USA. Made from recycled materials. Use on: Tile, Grout, Concrete, Gunite.