The last book covering a part of this subject has come four years ago (Vymazal, J., and Kropfelova, L., 2008. "Wastewater Treatment in Constructed Wetlands"; Springer, New Yark) and the one prior to that six years ago (Crites R. W., Middlebrooks, E. O., and Reed, S. C., 2006," Natural Wastewater Treatment Systems"; CRC Press, Boca Raton). Both are excellent treatises but neither covers systems based on nutrient film technique even as it is in this...