In Part 7 of this Limited Series from Particle Measuring Systems, contamination control experts Marc Machauer, Global OEM Business, and Mark Hallworth, Global GMP Specialist, discuss nonviable particle counter sample tubing concerns raised by the most recent EU GMP Annex 1 release. Their conversation includes how particles act in tubing, optimum tubing length, acceptable risk, and other variables contributing to obtaining effective and actionable particle counts in aseptic manufacturing.