Can I compost my cat's litter tray? I know you're told not to, but the material I - or she - uses is shredded cardboard, she has no diseases [she never goes out, she's too nervous], and her food is almost entirely dried packet stuff. If I shouldn't use it, why not? Or can I put it in the brown garden-stuff bin for the council to cope with, where it'll be a much smaller proportion of material among the piles of other people's garden waste?