Wet collectors use water “spray “to collect and remove particulate matter. There are many variations of wet collectors but they may generally be classified as low or high energy scrubbers.low energy scrubbers of 1 to 6 inches of pressure drop may consist of simple spray towers,packed towers or impingement plate towers. The water requirements may be 3 to 6 gal/1,000 ft3 of gas and collection efficiencies can exceed 90 to 95%.the lower energy scrubber finds frequent increases application in incinerators