Abstract: The present invention relates generally to a system for use in filtering a variety of environmental substances, and more particularly to a method and apparatus for filtering such substances as soil, sediment, and debris from such things as water runoff that may be entering storm drains or catch basins for example. The filter may be comprised of a base and a readily visible top portion. A storm sewer grate may then be inserted within the filter and placed in an opening of the inlet. Water may then be filtered, through either or both the top portion and/or through the base, before entering the inlet. The top portion functions as a visual aid, thereby allowing workers, inspectors and equipment operators to easily locate the storm sewer grate.