Thanks Bill.

Do you have any particular recommendations on compressors? Can a single 1/4 - 1/3 hp compressor handle 2 diffusers?

Just some googling shows that these typically retail in the $500-$700 range new and considerably less rebuilt. Are there particular retailers to look for or avoid?

I understand that the flushing is key here. We actually had a french drain put in behind the house last year to keep the water moving.