I also put together the Pump ( Gast ) and Diffuser from that thread. I have it in 14 ft of water in a 1/4 acre pond and am running it only part time and the pond is clean clear and sweet smelling and I have tons of happy fish. Best part of it all it is pumping about 1.5 SCFM creating a nice circulation and it all cost less than $80 installed.

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1/10 - 1/4 acre pond plus 16 ft deep/ Plus 40 ft by 20 ft by 6 ft deep koi and fathead minnow pond next to it. Upstate NY