Thermal Sublimator

When mining, your harvester never targets water ice — every cycle re-targets another deposit at the same field instead, so your yield of the rarer isotope ices goes up. Heats the intake to just above water's sublimation point — water flashes to vapor and vents; deuterium and helium ices pass through. If a field carries nothing but deposits this module rejects, a mining cycle there returns nothing.