No it doesn't and it is SO much cheaper and honestly I never smell urine. I do clean out the soiled litter once a day. I use to do it twice a day until my friend said I need to stop catering to the bunnies. She said I was probably the only person that literally cleanedthe litter boxes twice a day. I agree, I do however empty out the poos and always give them fresh hay. My piggies (bunnies) eat a ton of hay.