The Xprep-3 is a 3 channel sample filtration unit designed to use for both batch method and column method. The instrument consists out of three independent filtration units, all of which can be equipped with quartz frit filters or joint columns. The quartz frit separates the water from the activated carbon after the adsorption stage. Then the column adsorbs the halogens, while running the water at a rate of 3 mL/min. The columns must be emptied in a cup before they are introduced into the Xplorer. The quartz frits can be introduced directly. Each autonomous channel is pressure- and therefore speed adjustable while running, for both Adsorbable Organic Halogens (AOX) methods.