Here is what I did for my DIY aeration. First off I read most everything on here concerning what to do and not to do. These guys know their stuff.
I went to
www.hoosierpondpros.com that is linked above in Esshap above note and purchased my weighted tube and the Vertex diffusers. I only purchased the disks and built my own bases like many on here had done. I am about 17 feet deep so I went with an ebay rocking piston compressor. Between parts from Amazon and Lowes I pieced a manifold together and got mine all running. I am going to add 2 more diffusers to the shallow end that will mainly be for winter de-icing.
good luck and there is lots of info on here.
Dave
