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D-D UltraFlow Weir Comb Designed by D-D and produced within the U.K. Maintaining high flow through a standard a weir comb isn’t an easy task, weir boxes are usually manufactured to be as small and unobtrusive as possible but that often results in the display aquarium run height backing up due to the short linear length of the top of the weir glass and to the added restriction of a standard weir comb. The D-D UltraFlow weir employs horizontal and vertical drain slots allowing around 30-50% more water to flow through the slotted sections compared to a standard