Angler is correct.
This is what I use all the time. I use the thinnest batting available, 'light weight'. I use it in my smaller tanks with the whisper filters. I have lost some of the clips to hold the top of the filter material to the green frame, but then I just use a rubber band to hold it together. Also, have been using *JK47s' idea. I put a bunch of plants behind the white filter, and don't use any carbon at all. Going on 3 weeks now, all param's are great! You should maybe try it ! ? 