[SE/K2] fertilizer/nutrient gel?

[NineNine]

As per the subject, I'm playing Space Exploration + Krastorio 2. I can't seem to figure out how to process vitamelange without running out of fertilizer (and fertilizer requires vitamelange). Without describing the whole production cycle, is there something not obvious that I should be doing to make sure that the cycle doesn't run dry? I am producing fertlizer on Nauvis using production modules.