Originally Posted by Ozydego
My mistake, it just looks as though the initial pick up is at the far left section and the last output is in the right partition, so to get back to the start the flow would need to go through the gravel... Or is water able to get around the partitions?? I wouldnt call it a true UGF, but some mechanical filtration if it goes through the gravel at the bottom...
the filters pull the water from one section into the one to its right. the water then returns through 9 holes drilled in the dividers, as well as through 5 slits drilled at their top (for surface flow). the dividers are glued to the bottom of the tank, so there is no flow through the gravel.