I'll chime in here, have you actually tested to see how easy it is to churn? It's fairly bouyant stuff. My first tests of it didn't cause the type of movement I was expecting, and at least based on the way I have been trying to do it, it is my opinion that the sinking media would churn easier with air. I will be trying a few more scenarios this weekend to see what I can do about the churning. If you have tested and have suggestions to improve my results, I'm all ears, even if you haven't tested I'm open to suggestions.
The thread on on the other parish...
http://www.koivetforums.com/forums/s...ad.php?t=14014