The purpose of the first interview is to 'filter out' people who are not good candidates for the job.
a spam 'filter' [=a program that keeps you from seeing spam or unwanted e-mail]
They've begun 'filtering' their water to remove impurities.
(..) Someone should really close that loading door. Well, that's that. The room's compromised. They'll have to change all the filters, probably shut it down for weeks. You were right. Go ahead, call Building Services. Tell them it was my fault. (..)2014 TvShow: The Big Bang Theory Title: The Clean Room Infiltration Season: 8 Episode 11