I have had more problems with this thing and water flowing through it. Yet again, there is **** collecting at the top of my water. This time though i can tell that the water has not in fact stoped flowing through it becuase the water level in the exit chamber is lower than the rest of the water. I did what was recommended last time and took out the tube in the last chamber and this is working much better. But i still am now noticeing an accumilation of **** at the top of the water column.