60, 100 m and control treatments. However, presence of micro-screen or mesh size did not significantly affect the decrease inCODDISSobserved (p = 0.783). CODPARTand CODDISStrends affectedCODTOTAL(p = 0.032), and at day 42, average CODTOTALwas 52 mgO2L−1for the control group, and 30, 25 and 30 mg O2L−1for the100 m, 60 m and 20 m groups, respectively