I am looking into some alternatives for Nitrogen and Phosphorus
removal from stormwater. Real estate is tight and we're generally
lookign at vaults and piping. A vegetated pond is least desirable due
to the real estate invovled, and groundwater is high such that
infiltration is not likely effective. Are there off-the-shelf
products such as inserts available that can treat generally urban
runoff to 0.5 mg/L Nitrogen and 0.1 mg/L Phosphorus? I've had little
luck locating a simple solution.