I have been needing to drain both tanks to get the water out. Took a bit to get the air pressure down, but got it done. The gas compressor was easiest, about a 30 gallon tank. The 60 gallon took a while to bleed down. But I made it through. The 60 gallon CH compressor is 10.5 CFM at 90 PSI, the gas one is 9.3 CFM at 90 PSI. With them both running, I have close to 20 CFM going. Not bad for my little shop.