What I have been told is that it runs at 50 psi and delivers air via a valve or restrictor. It runs approx. 1.5 minutes every 5 minutes which is far too often. At the very least it needs the pressure increased and a regulator added to drop the psi and flow so that the cycles are reduced.
Sounds like using a compressor that is not really specifically built for the job? A high pressure compressor doing low pressure work maybe?
One way to cut down the cycle frequency is to use a storage tank. Say for example a 500 or 1000 gallon propane tank. Then the compressor might run for ten or twenty minutes (up to cutout pressure), but stay off for an hour. Regulate the flow at the output of the storage tank. Same concept as a shop compressor. Larger tank means longer run time but fewer stops and starts. Same thing with water system that uses pressure tank. More storage == longer run time and less stopping and starting. Right now the volume in the lines is the only "storage" volume you have, thus the frequent cycling.
Normally an aeration pump runs all the time with the pump matched to the required cfm. Sounds like you got more pump than you need. Cutting the cycle time down would help out on the electric cost a bunch, not to mention less wear and tear on the motor and compressor.
