초록 ▼

A sump tank insert is inserted into preexisting catch basins and is covered with a grate that acts as a primary filter for large debris. A deflector plate is positioned across the inlet to the tank and a filter basket is suspended into the tank from the deflector plate. Surface water flowing through

A sump tank insert is inserted into preexisting catch basins and is covered with a grate that acts as a primary filter for large debris. A deflector plate is positioned across the inlet to the tank and a filter basket is suspended into the tank from the deflector plate. Surface water flowing through the grate and the secondary filter of the filter basket flows through a tertiary filter comprising fibrous synthetic filter media interposed between the secondary filter basket and the outlet pipe. The filter media of the tertiary filter is selected according to the type of contaminants that are to be removed, and petrochemicals such as oils from cars that is contained in run-off from parking lots and the like.

대표청구항 ▼

[What is claimed is:] [1.]an insert body sized to fit into said pre-existing catch basin, said insert body having an upper peripheral edge defining a shoulder and an outflow pipe positioned for fluid connection with said sewer outflow;a removable plate on said shoulder to define a catch basin interi

[What is claimed is:] [1.]an insert body sized to fit into said pre-existing catch basin, said insert body having an upper peripheral edge defining a shoulder and an outflow pipe positioned for fluid connection with said sewer outflow;a removable plate on said shoulder to define a catch basin interior beneath said plate, said plate having an opening therethrough;a removable grate on said shoulder and defining a primary water filter;a perforate screen extending through said opening through said plate and into said catch basin interior, said perforate screen having plural openings defining a secondary water filter;a tertiary water filter between said secondary filter and said outflow pipe, said tertiary filter comprising filter media selected for filtering contaminants passing through said primary and said secondary water filters, and further comprising selected synthetic fibrous media sandwiched between opposed perforate plates and positioned such that water flowing into said outflow passes through said tertiary water filter.