What are the disadvantages of killing the BB? I never have any problems, I just rinse it in the sink and place it back it. However, my friend did the same thing, but when he turned his filter back on, debris came out and clouded his water for days. This happened because when he removed the old cartridge, there was still debris in the bottom of the filter, and when he put the new cartridge in, there was still debris in front of the cartridge and when the filter started up, the particles came spewing out. I was just wondering what I could do to ensure this doesn't happen because it would most likely be game over for and of my marine-life.