I tried it too -2 didn''t mind it too much -but Sophie just went at the side of it outside the tray and she is always spotless with her habits - gave her another tray with another litter in and she used it !
Don''t use it anymore -have been using a great litter called AK cat litter -they have now stopped doing it after 3 years !
Luckily i got the last 12 bags ,which will last me around 8 months now -but don''t fancy the looking again for another sort !
Have tried quite a few over the years , but this had been the best -and now they are stopping it -typical !