Faecal particals aside, what they add up to is faeces, but if the formation of the faeces is an arrangement into multiple concentrations of faeces, then it is faeces. If it arranges into a single concentration, it is a faece. Whether or not faece is an actual word is besides the point. All you must do is write a book with the word in it stating its use, and it can be assimilated into the oxford disctionary, which means it is a real word.