Catch basins are designed to quickly remove stormwater from a street, parking lot or drainage area. A catch basin filter can be used to help remove pollutants and can be a temporary measure during construction or a permanent unit for continuing maintenance and protection of that inlet. Benefits of Drop Inlet Filters are that they are easy to use and install and are the last line of defense in protecting receiving waters. Curb Inlets are much like drop inlet filters except water drains through a horizontal opening in the curb cut. They are designed to remove the pollutants while allowing the water to still leave the designated area without ponding. Overflow mechanisms are designed into all of the ACF Curb Inlet filters to prevent ponding. Curb Inlet Filters are easy to install and maintain. Another benefit is that they are designed with built in overflow.