5. A system for filtering a sample in an analyzing instrument, the system comprising: a flow tube fitting to an outlet port of a mixing chamber and configured to form a fluid communication path between the mixing chamber and a sample analyzing device; and a filtering device arranged proximate to the mixing chamber, the filtering device configured to prevent at least some of oversized particles from passing therethrough while enabling particles to be analyzed to pass therethrough, wherein the filtering device includes a non-mesh body having a plurality of approximately circular apertures and approximately semi-circular partial apertures, wherein the approximately semi-circular partial apertures are formed along an edge of the body, an aspiration device, wherein the aspiration device pierces a sample container to aspirate at least a portion of the sample from the sample container to a probe, the probe configured to dispense the portion of the sample to the mixing chamber.