Micro-muck
This is air pollution muck - NSEU - and its sink rate is very low within its water carrier.
Thanks for the 400Kg/hr figure. I was wondering how 'leisurely' the scavenge was.
If a dam of ice released a cascade of clean water into the water scavenge area, would 400kg/hr of water be enough to slow the engine? If so, the case against the dirty snowman collapses, and 'my' finger points to ice in the fuel.