UltraTech Phosfilter media filter bag. Advanced catch basin filter captures multiple pollutants, also provides sampling capability. Ultra-HydroKleen units are custom made to fit each individual catch basin. Excellent for removal of phosphorous. Hydrokleen is the only catch basin filter that allows you to use more than one type of filter media. This BMP removes hydrocarbons, heavy metals, sediments and other organics from stormwater and industrial runoff. Exceeds 80% sediment removal efficiency. Patented filtration system allows different filter media to be used together to remove targeted pollutants.