A simple description of the thin film fixed bed reactor (TFFBR) is given. The work has applied different methods of sedimentation of the solar catalyst suspension, including a new development of the method being used to meaure the fixation index as well as, the study of the temperature and mechanicaly - treated surface effects. The results of original waste water (taken from Barada river - Damascus) treatment, and a model waste water (with DCAA) treatment, Using the TFFBR , under SYRIAN climatic conditions, were discussed too .