Hey, I'm with you guys, if it doesn't work I'm going to get my money back.
It's not just another under gravel filter. It contains Bacteria rocks
http://www.monsterfishkeepers.com/forums/showthread.php?t=97979 like the ones in this post.
When I was speaking with the guy over the phone he said something along the lines of packs and the filter cartridges helping convert the nitrite into nitrates.
http://www.hiq-usa.com/zero_water_exchange_tech.asp It's the bacteria rocks in the towers that turns them into nitrogen gas which floats to the top and out the tank.
Ill keep you guys posted on my fish. So far they're doing fine.