I worked an internship where we were testing 'toilet to tap' in south florida. For the most part it was effective and not too price with RO (Reverse Osmosis) +

I worked an internship where we were testing 'toilet to tap' in south florida. For the most part it was effective and not too price with RO (Reverse Osmosis) + MBR (Memebrane Bioreactor) but the hardest problem (lol) was Viagra, quite literally. Getting pharmaceuticals out took so much energy with the process that the economics of it just weren't attractive enough.