The 2600FF series of filtration catch basins feature a two or three-part, stackable structure that is made of polymer concrete and comes with a grated cover. It can be used in conjunction with the PolyDrain Trench Drain or as a stand-alone unit. The basket inserts that hold the replaceable filter have built-in overflow relief. Units are easy to inspect and clean. Basket and filter modules can be retrofitted to existing PolyDrain 600 Series catch basins.