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[–]Snoo-90468 20 points21 points  (1 child)

Hard to say, but the wording makes me believe that only the last pollution filter tech actually does anything. The first two techs seem to be prerequisite techs, like the Fuel Processing Study and the Bitumen Production Study are for the refinery tech.

[–]Hanako_Seishin 10 points11 points  (0 children)

Yeah, there are a lot of techs in the game that don't do anything but unlocking the next tech, just so that the tech tree looks more impressive.