Boxplots for the six chemical-physical parameters: E. coli = Escherichia coli (cfu), Cond = Conductivity (μS/cm), Ammonia nitrogen = Ammonia nitrogen (mg/L), COD = COD (mg/L), Total phosphorous = Total phosphorus (mg/L), Dissolved O2% = Dissolved Oxigen (% saturation); analysed in the three monitoring phases (A.O., C.P., P.O.). Median values are represented by a horizontal bold line. A.O. = 3obs., C.P. = 3obs. and P.O. = 12obs.