No, the water/ammonia that went into the start of the PROCESS. You're re-collecting it at the end, obviously. But you already have blocks that interface with the end of turbines to prevent lag generated by block updates from the steam, just make one (or a multiblock) that fully collects the ammonia at the end of the turbine, once it's done all the work... heck, just route it into a special pipe that you have to surround with water or LN2 (wait, that would solidify the ammonia, wouldn't it?) or something, and after X many blocks it should all be condensed back into liquid.
Basically my suggestion is to give us a way to recollect our ammonia without having to deal with loose steam blocks or catching drips in reservoirs. I assume that the use of ammonia was not accidental, if we have real-world turbines that run off of ammonia steam, how do THEY recover the ammonia? Water steam nobody probably cares overly about, seeing as how we don't use the water that's actually touched the fuel... unless I totally can't remember how nuclear plants are constructed/run in ELI5 (Explain Like I'm Five) terms.
Re: logarithms and math.
Cheat and use Google/Wolfram Alpha (I can't do logs on paper, and my calculators all suck. Google works great as a calculator!)
I too royally suck at logarithms. I mean I understand what they do on a graph... but I never took the time/effort to learn them properly, and wouldn't have maintained the knowledge anyway. No use for them in my everyday life :-(