When they go pee or whatever, they dig a hole, then kick it back over the top. Bits get caught in their paws, in their hair if they're long haired. They come out of the tray and walk it about. So you end up with pieces of litter all over the place. The furthest the normal oko seems to get is about 5m.

Another day, and the amoun, or lack of tracking with this stuff is significant compared to normal OKO. Zooplus have a deal on at the moment where you get 3 bags for £21.50.