Pros and Cons of Pneumatic Conveyors

Pneumatic conveying is achieved by creating a pressure differential along a pipeline and using the air that moves toward the area of lower pressure to move bulk material, how ever using Pneumatic Conveyors has few advantages and disadvantages.
http://engineeringfacts.blog.au.edu.pl/2012/06/06/pneumatic-conveyors-benefits-and-non-benefits