The invention provides processes for purification of aqueous industrial liquids from perchlorate ions by reducing perchlorate ion concentration or by precipitating a water-insoluble perchlorate salts. The array comprises: a plurality of stitching blocks, each comprising a plurality of pixel sensors disposed in at least one row group; and first and second groups of addressing lines, the arrangement of pixel sensors and addressing lines in each stitching block being the same. An indication of an outcome of the wager may be received. The small heads each have the plurality of print elements arranged in columns, the number of print elements being equal to an integer times the number of time-division drive blocks.