This not ring any bells with anyone?

I think it was an aluminum bottom and sides with mesh ends. At the one end there was a curved hood that with all the air bubbles from the blowers mounted on top of the hood would move a bunch of water through this shoot. All the waste would then settle to the bottom of the pond.

[Linked Image from corvettejunkie.com]
http://www.pondboss.com/subscribe.asp?c=4


7/8th of an acre, Perch only pond, Ontario, Canada.