Originally Posted by Anthony_G
Yea its a white filter and its almost like lil rocks in em. Each filter has two filters in them. Four including the black ones I had to cut out and put in front of the white ones. Couldnt tell ya the name Im not at home right now.
Most likely its some type of Whisper or Aqueon filter based on the description. Next time you change the filters, you can leave the lil rocks (carbon) out of them, and I would replace only one of the two in each filter when you do. These surfaces are were your beneficial bacteria are growing, removing them removes the majority of your filters. Once you have replaced each of them (and thereby removed the carbon), I would rinse the filters both white and black as needed in tank water (not chlorinated tape water), and reuse them until they wear out.