LOL at the 'stink of chemicals' line btw. What is wee if not Urea and various Salts. And poo, chock full of broken down haemoglobin, and if healthy a 1/3 to 1/2 is dead bacteria all of which are merrily decomposing to make a vast range of chemicals!
Just found this on the internet....can't believe this but someone made a study of the chemical composition of human faeces!!
The generation rate of the elements in the excreta was 7.6-7.9 g N/cap/day, 1.6-1.7 g P/cap/day, 1.8-2.7 g K/cap/day, 1.0-1.1 g S/cap/day, 0.75-1.5 g Ca/cap/day, 0.25-0.4 g Mg/cap/day, 9-16 mg Zn/cap/day, 1.4-1.5 mg Cu/cap/day, 0.3 mg Ni/cap/day, 0.02-0.03 mg Cd/cap/day, 0.07-0.14 mg Pb/cap/day, 0.01 mg Hg/cap/day and 0.8-1.1 mg B/cap/day. The metals (Ca, Mg, Zn, Cu, Ni, Cd, Pb, Hg) are mainly excreted via the faeces and the remaining elements (N, P, K, S, B) are mainly excreted via the urine.
Wow all those 'chemicals'!