Well I'm not sure what type it was, I bought it from BigAls as a Tetra Pond Filter (it was only $7.99) but when it arrived it looked much different from any of the posts showing the stuff in that RC thread. Its like a "tight" mesh on the bottom and very thin, say 2mm thick, then it has all these little offshoots that loop upwards to make it "thicker" yet it wouldn't really provide much in the way of "mesh" for what we're looking for. So I cut the offshoots off and just used the bottom layer. I put two layers on, but I think that the PF4 Enkamat, being thicker, would do a better job as we could get away with just two layers of that, but this stuff I have probably needs about 6 layers or so to be truly efficient (and its a huge PITA to get it on over the needles on the impeller
).