The PetSafe-ScoopFree Sensitive Crystal Litter Trays are great for a cat that doesn’t like scented litter or Jax issues with litter that is scented.   The trays come in a three pack that lady’s a long time.   I love this litter box and how easy it is to use and how long these refill boxes last .   If your cat likes their litter box cleaned right away,  and you hate to always be scooping, get this litter box and try it with the sensitive litter for for no scents.