I have been searching the internet, visiting pond shops, garden centers,
and Koi shops looking for air diffusers that would handle 2 to 3 cfm of
air in a pond. Many aeration systems come with such air diffusers, but
I couldn't find anyone who sold them individually. The Koi shop I went
to yesterday gave me a good lead:

www.aquaticeco.com

They seem to have just about everything including 5 cfm air diffusers
and shoulder length pond gloves.

The Koi shop says they are a reputable firm and are quite helpful if you
call them up. [1-877 Fish-Stuf (347-4788)]

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Cheers, Steve Henning in Reading, PA USA
http://home.earthlink.net/~rhodyman