The Passive Skimmer is designed to remove oil permanently from catch basins and storm basins. The Passive Skimmer fits in almost all catch basins, sumps, vaults, and holding tanks. This unit floats on the water surface and continuously absorbs oil. The unique polymer absorbent actually bonds the oil tot he polymer matrix and prevents leaching. The 22" x 14" x 2" unit can hold up to 2 gallons of oil and will to create ponding or clog due to sediment. Helps comply with NPDES, 40 CFR 122.26 (1999).