[chemonk]

yeah... u should use the same litter u used previously. u might also want to consider putting the used litter sand in the new litter box (it might be a bit smelly) but to train them to get used to the new litter box, i think u should use it for a while.. through my observation, cat like to smell the place before he/she start to poo-poo or pee-pee... hihihi... so, by using a bit of the used litter sand... perhaps they will know that that is right place to do his/her "business"... hihihihi... good luck~!