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Orthos has numerous screen slot widths that vary from 0. gila slot 86 1 mm (or 4/1000 inch) for very small ion exchange resin up to 5 0 mm (or 3/16 inch) for underdrains with a deep gravel packing layer Most filtration applications tend to result in screen slot widths between 0 2 mm and 0 5 mm Orthos polypropylene nozzle cages are color-coded for ease of