(3) No seasonal differences were found in the performance of biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS) and pathogens, except in winter. During that season, the removal of those parameters was significantly lesser, although the removal percentages have never been below 40%.
(4) No significant differences were observed between cattail and reed performance with regards to their purification ability, however, cattails showed to be by far (almost a factor of 2) the greatest producer of biomass.