Diffuser spacing at 175' would in my opinion be the maximum separation distance. This assumes that each diffuser receives at least 2cfm of air. The less air a diffuser receives the fewer bubbles it makes and the less water it moves. If you are delivering only 1 cfm per diffuser then closer spacing would IMO be needed. 2cfm x 5 diffsr = 10cfm. 0.75 hp compressor delivers about 10cfm. The island is deflector of water movement; thus the shape requires more diffusers. I do not like islands in a pond due to water circulation problems plus it adds more shallow water weed problems, but some like the look of islands.
Last edited by Bill Cody; 04/20/20 08:29 PM.
