(b)(4).The sample was returned for evaluation.A visual exam was performed and there was no visible sign of any damage to the water bottle except there was a 10cm bubble inside.This bubble formed during the bottle blowing process and it was from the same material as the water bottle itself.Although approx.1/4 of the holes were occluded on the diffuser, the water bottle sample passed back pressure test.Functional testing was performed and it was found that 1/4 of the holes were occluded and 3/4 were free of occlusion.A review of the manufacturing event log shows that no issues that may have contributed to any quality issues reported.All process parameters were within specification, and all in-process qa inspections were acceptable.Based on the investigation performed, the reported complaint could not be confirmed.There were no functional issues found with the returned device.
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