It's very unfortunate that the litter can't clump the urine because after about 4-5 days the litter gets nasty and my two cats refuse it which lead to them peeing and pooping outside of the box. The litter trays are way to expensive to change weekly and we got this product to help with having to scoop as often since I'm currently pregnant and my husband doesn't want to do it every day. Cats are picky where they go to the bathroom (at least mine are). If they feel their area is too messy and/or smelly they don't want to go in that area. If this box was able to remove the urine with "clumping" style litter this box would be great.