I waited 5 months for 3 Luuup litter boxes to arrive (ordered through the Kickstarter campaign). Every day as I scooped 3 cat boxes I fantasized how my scooping duties would soon be over. Such naive dreams. If cats just pooped, the boxes would be brilliant, however as mentioned before the urine is the problem. Mixed with clay litter it forms a stick, cement-like substance that requires scraping to clean it off the sides of the box and out of the slots. If you don't wash the tray, the sticky mess will contaminate the tray it's rotated under. Oh, and watch out that the "cement" doesn't go down your drain. On a lighter note, my cats like the boxes -- no "accidents" on the floor, which is an improvement over my last investment of 2 Cat Genies!
Bottom Line: No, I would not recommend this to a friend
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