My filter is the Filstar XP3. The filter has the three layers so I have a blue bonded filter pad in the bottom then an ammonia pad, fluval biomax in the middle layer, then another blue bonded pad followed by my carbon in a media bag. Not sure if it is supposed to be like that but im new to the canister setup so Im trying to learn. I have replaced the filters once but I have mainly just been rinsing them in hot water to clean them then cold and put them back in. I bought the tank used and the guy said the biomax was almost new so I just rinsed it in hot water. I will replace if you think I should. I never knew that about the water clarify stuff. It just masks the problem instead of fixing it.... I replaced the carbon with new and only used the biomax used when I setup the tank. My fix are all happy and doing great. I test the water for nitrate, ammonia and ph every other day and its perfect. I have 2 swordtails (I got them to cycle the tank then I got attached to them) 4 Dwarf gouramis, 3 angels, 2 Red lined sharks, african featherfinned catfish, chinese algue eater, 2 clown loachs, 2 silver dollars, a betta (not by my choice), reticulated hillstream loach, and last is my 4 inch baby fire eel. Almost all are babies except for one silver dollar and the chinese algue eater. The Betta is also almost three.