Leslie's is for anyone with a pool. The company was established in Southern California in 1963 and is the nation's largest store of its kind, with more than 600 locations across the country. It sells supplies that customers need for their conventional or above-ground pool, hot tub or spa, such as filters, skimmers, brominators and pumps. It also carries the chemicals to keep it clean, the equipment to maintain it and the toys, floaties and other accessories to enjoy it.