Hi Charles,
We've identified the last filter in line as an OPRP.
Hi Selena,
Are these items associable to an aperture size ?
Their are several threads here on validation/verification of filter CLs (or your equivalent target).
Target area of choice usually varies between integrity of filter and aperture size.
Previous threads have discussed your query but limited agreement resulted, can try this lengthy discussion for some ideas -
https://www.ifsqn.co...p-verification/
Here is one "approach" which utilizes a concept mentioned in above link -
Validation liquid filter.pdf 126.82KB
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(for conveyor systems/metal hazard Codex gives a MD {expensive !] option to validate a mesh filter)
PS - this article discusses validation via the filter integrity route -
https://www.biopharm...ess-environment
PPS - bit more explanatory material for attachment above -
validation filtration.PNG 94.1KB
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