These systems can be of Wet type or Dry type.
Wet Type :
Sequence in ASU as follows:
Lour - coarse filters 20 - 25µ → Air washer -/ dust washer → Water sparay → Water eliminator → Bag filters 10µ → De-humidifier bank (chiller/heater) → Droplet eliminator → Bag filters 5µ → Blower.
Dry Type:
The system consists of three stage filtration, including coarse + 20 micron + 10 micron filters.