How is gear oil filtration efficiency measured?

Efficiency is measured by:

Particle Count Analysis: Comparing contamination levels before and after filtration using ISO cleanliness codes.
Differential Pressure Monitoring: Observing pressure changes across filters to assess clogging.
Laboratory Testing: Analyzing samples for water content, acidity, and particulate matter.
Equipment Performance: Noting improvements in machinery operation and reduced wear.
Filter Life Assessment: Evaluating how long filters perform effectively.
These metrics help optimize filtration processes.