What is the void ratio of filter media?

What is the rate of backwash water?

What is the mixed liquor?

What is the porosity of these synthetic media?

Which of the following is not used as a media for trickling filters?

In which type of trickling filter very low power is consumed?

For rock type high filtration rate trickling filters what would be the BOD removal rate?

What is the air scour rate which is provided before a water backwash?