The X2 is designed in such a way that all valves and internals of the filter are double that of a regular filter. At no time does each pumps water pathway get smaller than a 2" opening. Every thing is double on this filter so that we maximize the flow potential of each pump. The X2 is designed with the same integrity as the AquaBead and AlphaONE filters - designed to maximize the flow and efficiency of today's modern koi pond pumps. We remain committed to providing the most energy conscious filtration products in the industry.