Here's my step by step for making a fluid bed, as I messed up my photo bucket account I redid it so you'll have to go to post #18 to see the pics http://www.crappie.com/crappie/pouri...uid-bed-build/
One change I did make was a different nozzle which should make the air flow better - Stumphunter told me about it, I twisted one of my cups in too tight and when I went to get it off pulled the bottom off so I popped out the old one and used the new one - here's a pic of the new one Watts 1/4 in. x 1/4 in. Lead-free Brass Barb x MIP Adapter-LF A192 at The Home Depot
Like Cray said they're easy to put together - I don't have TJ's filters only because I had a member send me some filter material he got from McMaster Carr but I've been unable to match it to get more - if I run out I'll get some from TJ