A few years ago, I read in a book that it is feasible and safe to manufacture colloidal silver at home using electrolysis. I was intrigued, because my father had conducted many similar projects with success, in the kitchen, in the garage, and in the backyard, as he worked for EH&S. The Dunning-Kruger swelled within me.
I reviewed photographs of the home lab setups, and I evaluated ingredient/supply/equipment lists. I even inquired at my credit union's branch whether they could sell me silver bullion, which was hysterical in retrospect.
Then, as I slept on it a few nights, I had nightmares of this electrolysis lab just getting out of hand, taking over my bathroom (where there is actually no space for anything else) and just ruining my dull, ordinary life. I don't even have any roommates or family living with me here.
So of course I decided not even to try this. This NYC apartment seems similarly constrained. If I were their landlord, I would dread finding someone running this kind of crap. Insurance and liability are the biggest problems here. They should go purchase a home if they want to play around.