Just wondering what the real difference is between these two sintered glass media. The only thing I've found is that the Pro is traditional hoops style media, whereas the non-pro is like stone chips. I have some of the non-pro in one of my filters and haven't had any issues. The only thing I can think of is that the pro would probably not restrict flow as much as the non-pro. Any other thoughts on this? Any other recommendations on other sintered glass media?