it is recommended (search, you'll see) that at home you don't wash your underwear with your other clothes because there is a nonnegligible amount of fecal matter and associated bacteria remaining after washing.

extending that notion to nappies being community washed in large vats (separated by mesh bags and kept separable?) is horrifying. I suppose they put in some chlorine bleach to sterilize? Still, chlorine bleach might whiten the masticated corn kernels but...