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[spoiler] 2nd pumphouse upgrade?

Lystraeus

Member
Vault Librarian
Messages
94
I'm struggling to discover the 2nd pumphouse upgrade. I think I've ruled out nearly every building - so either I've gone awry, I've missed something, or it has a 'special' method. Perhaps using sterile plastic? I'm assuming there is one, since all other upgrades had 2 options.

Any pointers would be appreciated :)
 
A helpful commenter on my tech tree says the Tool and Die shop is required. But I've got a couple, and neither unlocked the "Filtration plant". Only the hydration lab shows as a possibility.

Is this right? Or is it something else/a bug?
 
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