This report is being filed due to a retrospective review of complaints.This complaint has been re-opened for filed for further investigation.A supplemental report will be filed if further investigation provides information which changes the content of this report.The filter was returned as was visibly damaged as shown through side-by-side comparison with other filters.The product was significantly damage, but the root cause could not be determined.Potential causes could be damage during shipment/storage, user error, improper storage.
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