TC, that is still the definitive thread on the topic. I remember the first two times that I read it, being really quite surprised at the amount of psychological resistance to the idea, and all the (well to me anyways) rather skewed logic behind some of that resistance. A really good read at any rate.
"...I'd personally like to keep other people from contaminating my "waste" with chemicals..." - classic!!!
Yeah Carey, give us the run down on the system. Pretty impressive looking :) I remember seeing some similar if not these fotos some time ago on your page, had no idea the were pee-ponics, I think they were just labeled as experimental wall something...
This actually works better than hydroponics using reactive reagents because there is little salting, so much less maintenance. There is a word for that: salting and constriction of the apertures due to chemicals coming in contact with oxygen. In hydroponics a perforated tube needs to be chemically treated while PVC tubes need to have their bores cleaned/ re-punched. I add one to three fresh pisses a week during spring and early summer, then about 1.5 to 2 L of processed urine about once a week/ ten days maybe more, depending on if I see any signs of deficiencies.
Your greenwall is quite impressive and all from piss, there has got to be more to it?