I had the same issue, after manually recalculating the consumption / production in liter / day using the default TAC values I realized that the default values are wrong. The correct numbers should be (90% efficiency): CelssInputResources = CarbonDioxide, 261.779, WasteWater, 1.976, Waste, 0.674, ElectricCharge, 1296000 CelssOutputResources = Oxygen, 273.839, true, Water, 1.618, true, Food, 0.842, true Or on the fully self sufficient super-duper advanced part (100% efficiency): CelssInputResources = CarbonDioxide, 261.779, WasteWater, 1.976, Waste, 0.674, ElectricCharge, 1900800 CelssOutputResources = Oxygen, 304.266, true, Water, 1.798, true, Food, 0.935, true This should work as intended, the basic parts granting effectively x10 of the life support amounts stored at start and the advanced part supporting life indefinitely.