Surface water and sediment samples were collected at the inlet location (WI) of the CW system, close to the
output of the influent flow distribution box, and at the outlet location (WO), close to the input of the effluent
flow distribution box. The plants on the CW system were sampled from four locations, in areas containing
four different species: C. giganteus (Cg), T. domingensis (Td), E. crassipes (Ec), and P. cordata (Pc).
Macrophytes were sampled in a quadrat of 0.13 m2.