Leslie's Swimming Pool Supplies bills itself as "the world pool supply leader," and with its selection of pool cleaners, pool chemicals, pool heaters, pool pumps and pool filters for your above-ground pool, in-ground pool or spa, it may just be. Started in 1963 in a backyard shed, Leslie's Swimming Pool Supplies has grown into a chain of more than 600 stores and there is one in your neighborhood. The store also offers free in-store water analysis, free in-store labor on repairs and free pool school seminars. Its express parts program can find any part it doesn't have in its stores.