Pond Boss Forums AERATION Systems questions aeration

+1 My understanding, (and I am not an aeration pro!), my compressor is rated at 4.5 cfm @ 35 psig. To me, that means theoretically at 35 psig back pressure my compressor should deliver 4.5 cfm with a fixed displacement rocking piston pump. The flow will be higher at lower pressures as the leakage thru the pump will decrease with lower back pressure (pump efficiency will be higher at lower pressures). Theoretically, since my relief valve is set at 35 psig, I would drop from 4.5 cfm @ 35 psig back pressure to less than 4.5 cfm at 36 psig when the relief valve starts to pop. The actual airflow to the diffusers at 36 psig will be 4.5 cfm minus whatever is going out the relief valve. Just my thoughts!