The gas storage tank can only precipitate a small part of water under air pressure, which does not play a big role. Is the filter element of the oil-water separator aging and unable to play a filtering role? You can consider buying a freeze dryer, and the oil-water separation between the two units will definitely solve the problem. You didn't install an air storage tank before, so it seems to be a piston machine, right? If you still don't understand, you can ask me.