What Is A Stormwater Filter
As part of the natural water cycle, rain falls and collects in bodies of water and underground reservoirs. Through this process, the water collects pollutants, sediment, litter, chemicals, and waste in general that taints our water supply. The flow of the stormwater itself can cause erosion problems as well. Fortunately, today we have several types of stormwater filters to help protect our environment. One of the most basic and inexpensive stormwater filters is the sand filter. It allows water to pass through, but traps medium to large sediment and litter. Another type of stormwater filter is the cartridge filter, which is small, effective, and more expensive. These filters capture waste and pollutants, and are filled with different substances, including carbon, perlite, or zeolite. They must be maintained and recharged often, so the Center for Watershed Protection recommends no more than 5 acres per cartridge filter.