Thank you all who chimed in. That is exactly what I needed. I had the GAST pump checked and it is still good to go, so I will use your advise to the letter and hope for the best. I will use the multiple diffuser set up. My concern for non 24/7 operation is winter freeze when the water comes back into the line during non operation times. How do I insure against that? Just an fyi it took an act of God and the engineers at Iowa State to get me a formula on the capacity of compressed air in a fixed size container. A 100 gallon tank at 70 degrees with 120 psi will hold almost 68,000 cubic feet of free air.