Define swamp, are you referring to an extremely shallow personal pond or in fact designated swamp/marsh land. If it is the later and aeration causes damage to the swamp and you get caught the local department of natural resources will no doubt have a laundry list of fines and penalties regrettably.
The pump you linked from what I can tell looks like a rotary vane type compressor with what was a 1/4 NPT discharge off the unit and has been made larger through the 90 degree elbow to 1/2 NPT this will not increase flow.
As many on here will agree. Will the compressor work...it depends. Water depth, tubing run to the pond, number of diffusers planned, etc...
I would recommend shopping around more and reading up on some of the information contained on this forum.
This is a great thread to get you started it will answer many questions:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92494#Post92494I am sorry if this response is not the one you were seeking but it is a loaded question.