Collectively, the antibiotic removals in the CWs can be summarized with their medians in the following order: ofloxacin (92%) > lomefloxacin (86%) > tetracycline (71%) > erythromycin (65%) > roxithromycin (61%) > oxytetracycline (59%) > norfloxacin (56%) > ciprofloxacin (32%). This indicates CWs may offer at least a good performance for the removal of most antibiotics.