http://www.reefkeeping.com/issues/20...ture/index.php
That article may help you with setting it up and running it... I didnt like the directions from PM that came with the reactor (available on their website). If your reactor is the downdraft version as well consider using larger rather than the fine media as the fine media compacts relatively fast and forces you to service the reactor a lot more often. If you want a 'simple' to do DIY job to make a pH probe holder for the top of your reactor just ask and I'll show you pictures and a step by step on how I did mine.