Take active measures to conserve water though without setting numerical targets ■Water Risk Level C (to chemical substances in waste water (2) Comply with relevant laws (3) Manage waste water rationally based on scientific evidence (4) Utilize management systems based on both chemical substance concentrations and its environmental toxicity *2 Whole Effluent Toxicity (WET) tests are a way of evaluating the quality of effluent waste water by observing bio-response of aquatic organisms such as fish, daphnia, and algae.