Here is a current thread that has some information.
75 year old pond If it is just the equipment you want a google search will bring up lots and lots of places selling aeration equipment. Pumps, air line, diffusers and complete systems. If you want advice specific to your application look around the Pond Boss web site at some of their advertisers. There are experts available who will design and sell you a system that works right from the get go. If you want to experiment do a google search for aeration with the words pond boss forum in the search. A bunch of old threads with information will come up.
If you are looking for a single paragraph solution to what is a complex problem........ well good luck with that.
Welcome to the forum.
