A storm water filtering system located in a storm water catch basin, the basin having a storm water inlet spaced from at least one storm water outlet and defining a chamber for storm water collection between the inlet and the outlet. The filtering system comprises a plate for dividing the basin into a first chamber for receiving storm water and a second chamber for passing storm water out of the basin and a filter assembly mounted within a hole formed in the plate, the filter assembly including a filter media having a predetermined effective flow rate for removing pollutants from the storm water. The system further includes at least one overflow tube coupled to the plate at another hole formed therein for passing storm water through the plate and bypassing the filter assembly. The overflow tube has a storm water inlet at a height above the filter media so as to limit the maximum water pressure applied to the filter media. The overflow tube also includes a diverter lid mounted to a top of the overflow tube. The diverter lid has downwardly depending sides spaced from and overlapping the storm water inlet in the overflow tube such that pollutants floating on a surface of the storm water when the storm water is above the level of a lower edge of the lid sides does not enter into the overflow tube. In another form, the system includes a plurality of filter assemblies mounted within corresponding ones of a plurality of holes in the plate wherein the number of filter assemblies is determined by matching the outflow rate of the catch basin to the maximum effective filtering rate of the filter assemblies.