Just wanted to share my experience with the Santa Monica HOG 1.3 after 1 week. Prior to installing ATS I was running Bio Pellets. My Nitrate was controlled for several years using bio pellets but recently continued to rise and was up over 20ppm. I removed the bio pellets and installed the HOG 1.3 a little over a week ago. Nitrates were at 10 ppm today. Very happy with the performance of the HOG 1.3