There are several different ways to classify products. Filtration equipment is used to filter, thicken, or clarify a mixture of different elements.  

Examples include :-

Filtration mechanism (filter medium)

Process goal (cake, clarified liquid, or both)

Driving force (gravity, pressure, vacuum centrifuge)

Operating cycle (continuous or batch)

Material size (particle size), 

Process stage (pretreatment, solids concentration, solids separation)