The fish farm near me and numerous other aeration "specialists" sell lots of single 9" disk unit diffusers with a 1/4 hp rotary vane compressor. Many of the 9" disks have a normal operation cfm of 0-3cfm and max of 5 cfm. Right or wrong - the disks are probably getting somewhat over stretched with only one disk per compressor at 3-4cfm per disk. Over stretching a membrane no doubt shortens its life span.
Last edited by Bill Cody; 02/06/14 05:36 PM.
