This was the best thing we ever have bought for our cats. Twice a week I was changing cat litter and with me and my wife being ill and having lung problems that made it worse. Now every three months I do some maintenance and cleaning on the unit and in 1 hr its new again. We do not have to dread the weekly chore of cleaning the cat $%@#^ out of the litter box. It is wonderful to not have the Oder when you go in the laundry room to wash clothes. I even think our cats love us more for making the change from old box to new top of the line luxury. I would recommend this unit to anyone who loves their cats as much as we do.