[Richard and Rhonda]

To add a little more detail, and I'm sure Michael knows when, Newell used a water separator for some time, and later adopted a water dessicant cartridge.

The separator is aluminum finned and about 5 inches in diameter and close to two feet tall. Ok, don't go out and measure it, I just worked on one, one time. The separator literally has a ball of stainless steel wool in it to coalesce the water vapor. The fins are to cool the air and help the water condense. This was good technology at the time, but it has been superseded.

The later setup actually passes the air through a dessicant cartridge. I have that setup, and have never drained one drop of water from any of my tanks.

So the answer to the question, do I need a separate moisture filter depends on what type of water separator you have in your coach.