I got the external Miller filter with my plasma cutter, and curious if I should run that filter all the time in the shop, or only when operating off a portable air supply (such as a gas powered compressor I take to the field).

I'm replumbing my shop, and adding another water/oil seperator right where I intended to do most of my cutting. Is this additional filter necessary, or will it help, or should I save it for when I go mobile?