File:Trickling filter bed 2 w.JPG - Wikimedia Commons
Trickling filters following anaerobic sewage treatment: state of the art and perspectives - Environmental Science: Water Research & Technology (RSC Publishing)
Explain with neat sketches the working of a trickling filter. What is the principle on which it works?
Trickling filter - Wikipedia
What is trickling filter with diagram - Netsol Water
Trickling filter design guideline - How do trickling filters work? - YouTube