With the recent expansion, I now have a kidney shaped pond. Estimated water volume is 300,000 gallons. This pond will have two 9" disk diffusers. My compressor will not handle both diffusers simultaneously. A cheap solution I found was to utilize a "Y" garden hose fitting with shutoffs. For this ponds size, two 9" disk diffusers is probably overkill however, I had the extra diffuser so I decided to install it.
Update: Due to a major rain storm this past weekend, the pond is now full. This gave me the opportunity to test both diffusers. One diffuser is set at 8', the other at 11'. According to the pressure gauge, both operate at 4 psi. Based on the charts from the manufacturer, the compressor is putting out 1.25 cfm. By the looks of the surface "boil", I'm happy with the results.
