Forgot to add my flow rate. The box is 8"x 3.5" with 1000 gph going through it, so approx 174 gph per square inch. This number really does not need to be at an exact rate, but is a value that maybe need to be added on how the carbon might break down. Higher flow may cause the carbon to bash together and create more dust, but nothing on what a fluidized filter bed can cause.