Originally Posted by Darkblade48
What an interesting claim; I just don't see how this is possible...
Time to e-mail Seachem support
Its possible. There is anoxic zones in the media. Where there is deplete of oxygen, thus allowing anaerobic bacteria to grow. Aerobic bacteria ( not sure how to spell ) will be on the outer side of the pores, consuming oxygen. That is why deep inside the pores, there is lack of oxygen.