This all occurs in the top open bath (with hinged doors, with sealing gaskets etc.)
set atop a motorized base atop a kerosene reservoir.
Essentially, the etched metal is cooled and washed clean during etching by jets of kerosene
pumped (and filtered) from the 50-gallon base and directed upon the worked piece
by adjustable hoses (bendable nozzles attached to magnetic bases fed by plastic hoses).

This all while the machine etches away (see excerpt from the manual).