Substances: fipronil (ZOCSXAVNDGMNBV-UHFFFAOYSA-N) benzotriazole (QRUDEWIWKLJBPS-UHFFFAOYSA-N) clarithromycin (AGOYDEPGAOXOCK-KCBOHYOISA-N) carbamazepine (FFGPTBGBLSHEPO-UHFFFAOYSA-N) Keywords: monitoring sewer overflows