Passive skimmers remove oil permanently from catch basins and storm drains. First most catch basins, sumps, vaults, and holding tanks. It floats on water surface, continuously absorbs oil. The unique polymer absorbent actually bonds the oil to the polymer matrix and prevents leaching. They will not create a clog or ponding due to sediment. One 22' x 14' x 2' unit can hold up to 2 gallons of oil. Passive Skimmers help comply with NPDES, 40 CFR 122.26 (1999) when used as Best Management Practice in Storm Water Pollution Prevention Plans.