Founded in 1941, United States Pumice Company is an international marketer of block pumice, an industrial mineral mined in Mono County, Calif. The company maintains headquarters near Los Angeles in Chatsworth, Calif. United States Pumice Company markets a range of industrial and home and garden products, as well as products for animals. It specializes in products for professional services, including the Grillmaster brand of cleaning aids for barbeque accessories. Other brands include Pool Blok, a pool and spa cleaner, and the Pumie brand of scouring sticks. United States Pumice Company s products are distributed through retailers worldwide.