filtrate
The part of a mixture that passes through a filter, also called permeate.
The term "filtrate" was found in the following pages:
Link database: EPA-EAD: Method 1636: Hexavalent Chromium by Ion Chromatography
Fast and Automated Monitoring of Gadolinium-based Contrast Agents in Surface Waters | EVISA's News
Instrument database: Dionex Corporation - ICS-1600 Standard Integrated IC System
Link database: EPA-ORD: Method 218.6: Hexavalent Chromium in Water by Ion Chromatography