I am having to remove the filter cartridge from the intake chamber because it causes the water level in the pump chamber to fall below the minimum level that is marked on the side. The water almost reaches the top of the pump. Without this filter, I am not getting any chemical filtration, but the water level rises to a level between the minimum and the maximum. What do you all suggest doing? I have been fighting this problem for over a week now. Also, Just how high should the water level be in the tank? It is, almost, up to the top of the back wall. I know that it is New Years Eve, but I just thought that someone might check in. Thanks!