Received one (1) used list # 14687, primary plum set, clave secondary port, clave y-site, secure lock, 103 inch; lot # 4042166 for investigation.The unknown solution residuals are observed in as received used list # 14687 set and the 69" tubing is cut near cassette-dual.As received, the used set containing prior solution residuals was separated into two segments.The segments were inspected and no foreign matter/particulate was visible anywhere in the set.Deionized water was injected into both halves of the set and the fluid was collected and filtered using a pall gn-6 metricel 0.45 um filter in a vacuum filter.The filter was examined under the microscope and no particulate was found.The reported complaint cannot be confirmed.The lot history was reviewed and there were no nonconformities which would have contributed to the reported complaint.
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