Variables: concentration Substances: clarithromycin (AGOYDEPGAOXOCK-KCBOHYOISA-N) diuron (XMTQQYYKAHVGBJ-UHFFFAOYSA-N) benzotriazole (QRUDEWIWKLJBPS-UHFFFAOYSA-N) Systems: flow channel experimental hall Keywords: Chemcatcher sewer overflows monitoring polar organic pollutant