Review on CNZ Aquarium Filter Activated Ceramic by David Royles

This was the worst purchase I have ever made. I am starting a new aquarium and bought this pack because it seemed like a good deal. So I rinsed out the charcoal and tried to put it in my tank and it was scattering black residue all over the pan and tank. It looks like a black mess. I would have to empty my entire 150 gallon tank to clean it out, which would probably take a full day. I should also add that I used to have a tank. So I know how to flush charcoal. Please purchase this product at your own risk.