Really? I would like to hear more about that.
Are John's meds kicking in lately? He hasn't been around much. A new porous media. Interesting. Does it have dieletcric properties that cause it to expand and contract so the pores remain open, or is it just the regular kind? I would like to hear what ol' John came up with. I bet it's good. Where has he been lately?
Like John says, always test your media in a drum of water for a couple weeks and test all water parameters afterwards, prior to using it.