Abstract: A gravity liquid filtration apparatus with increased filtering efficiency includes a frame; a pool-forming assembly mounted in the frame, the pool-forming assembly including two spaced-apart, rotatable containment discs and a discharge element mounted between the two containment discs; a filter medium supply roll; a filter medium carrier assembly for pressing an elongated filter medium supplied by the filter medium supply roll against the peripheries of the two containment discs along corresponding bottom arcs thereof, this filter medium carrier assembly being intermittently operable to move new filter medium against the two rotatable containment discs; and a liquid input element for supplying liquid influent between the two containment discs and downwardly onto a downwardly sloped portion of the filter medium.