Social & Preventive Medicine Schmutzdecke refers to the following A Suspended matter in drinking water B Algae in drinking water C Algae, plankton, diatoms and bacteria on surface of sand bed filter D Alum flocculate on surface of sand bed filter 💡 Explanation Schmutzdecke refers to the following ✓ Correct Answer: C. Algae, plankton, diatoms and bacteria on surface of sand bed filter