Patent ID: 9017554
Filing Date: 2015-04-28
Classification: B01D,Y10T

Abstract:
1. An underdrain block for use in draining and backwashing filtering media in a filter bed of the type where liquid may be supplied to the filtering media from a position vertically above the media and passed down through the media to an underdrain system including a plurality of said underdrain blocks, said underdrain block comprising: a plurality of exterior walls defining a hollow interior and having a longitudinal axis, said exterior walls including a top wall, a bottom wall, and a pair of sidewalls extending between said top wall and said bottom wall, said sidewalls, top wall, or both having at least one external detail and said top wall having at least one aperture; and a handle detachably connected to the at least one external detail for transportation and positioning of said underdrain block, wherein the handle comprises a horizontal portion and two vertical portions attached to each end of the horizontal portion, and wherein an attachment point between the horizontal portion and each of the vertical portions is flexible enough to allow the vertical portions to be deflected outwardly a distance which is at least equivalent to a width of the at least one external detail, and return to their original positions when a deflecting force is removed.