Abstract: A apparatus for use in storm water openings equipped with a cover and openings that allow storm water into the storm sewer. The apparatus includes a plurality of troughs with a bottom and two sides that define the troughs. The troughs support an absorbent sock and directs storm water to openings between the troughs where the storm water discharges into a semi-permeable bag prior to discharge down the storm sewer. The troughs are equipped with small openings at each end and on each side of the trough with the purpose of holding a semi-permeable bag between two troughs. The structure, absorbent sock and semi-permeable bag are located on the peripheral portion of the storm sewer inlet. The structure is installed on the same support for the cover by a thin lip and the cover is placed on top of the lip. The absorbent sock provides the first stage of treatment of the storm water.