I've got an AirDog 165, and a CAT 2um filter, supplying my dual CP3's. So the A/D pulls from my sump sends it through my Baldwin BF1275, then to my Fleetgaurd FF5617, then to my CAT 1R-0750, and finally to the CP3's. I often run through the deserts of California, Arizona, New Mexico, and Texas...