For rock type low filtration rate trickling filters what would be depth assumed while designing it?

At what pressure is the air blown during cleaning?

While designing a blower for backwash for sand filters with air scouring what is the velocity considered?

Which of these don’t require a flash mixer and a flocculator prior to it?

For rock type of packing in intermediate filtration trickling filters what is the hydraulic rate considered?

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

What is the life of the media used?

Filter cycle is interrupted for __