A study based on liquid waste refining has been carried out on a three-basin channel (one anaerobic, one optional, and one of maturation) of microphytes lagooning at the liquid wastes refining station from the Arzèkè market in Parakou (Benin), from June to August 2014. Quality determining measurements have been used for ten weeks on samples collected following a daily frequency for some, and a weekly frequency for others. The average refining yields have reached 82.39% in MES, 86.04% in DBO5 and 86.18% in DCO. The MES supplemental concentrations of the refined effluent are positive in 50% of the used measurements following recommended rejection norms by the European Union directives (< 150 mgl/1). Elimination of the phosphor is low and unstable with a 19.75% in PO43 average yield. Azotic pollution reduction has reached 53.98% in ammoniac azote, at times going beyond 75%. Globally, the Azote and phosphor elimination is low, and the supplemental contents remain quite high compared to the accepted limit for an effluent rejection in a sensitive eutrophication ecosystem. Lowering the bacterial pollution is important, reaching 6.32 ulog in overall coliforms and 5.24 ulog for Escherichia Coli. But the supplemental contents (3, 71 ulog) remain higher than the WHO norm (< 3 ulog) for a non-restrictive re-use in irrigation. As for the salmonellas, studies have revealed that station adopt a partial refinement going from 40 to 50%.