What is the bulk density of pebbles assumed while designing a Pressure sand filter?

A floc particle must settle after agglomerating to form larger particles.

While designing a clariflocculator what is the maximum detention time assumed for the flocculation zone?

What is the maximum head loss at which the filter should be cleaned?

What is the mathematical representation when many plates are used?

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

While designing a sand filter what is the velocity that is assumed?

What is the life of the media used?