Originally Posted by 001mustang
Don't put filter underground.
Put filter/water separator down stream of the underground pipe.
Actually, you want the separator before it goes in the ground to remove any liquid oil or water before it goes underground. A t'd in blowdown will remove any condensation that develops in the pipe. Give it a hit about every 2 hours of use. Another option is to put in a pneumatic blowdown that will give it a hit every time the compressor cycles. These can be used on the separator also. Use a dessicant drier where it comes out of the ground to get any residual vapor before it goes to distribution lines. This system will give you air that is almost clean enough to breathe. Put oilers on the tool outlets and a filter/drier on the spraygun/booth outlet. Don't use the same hose for tool and painting.