Got 2 of these to try out with my older cats - had to replace 1 immediately,as it was broken in transit. Designed by Hagen's design team and inspired by cats and cat lovers around the world, SmartSift has many other unique features that set it apart from other litter trays on the market In addition to the easy-to-use lever system, the cat litter tray also includes a carbon pad that helps control odors.

The footprint of the box is similar to a large ordinary litter tray, where it is bigger is the height as the waste drawer is at the bottom, then the litter sifting tray is on top, around that is the hood so as long as you have a place that can accommodate the height it is not a problem. Besides the easy-to-use lever system, the cat pan also includes a carbon pad that helps control odors.

We use the EverClean litter with this, as we decided a long time ago that it is probably the best clumping litter out there. We've been using the Smartsift litter box for half a year already and we are very happy with it, our cats included. By pulling the lever on the side of the litter box, your cat’s waste is efficiently removed and dropped into the pull-out waste bin below.

We also found that the clumped litter adhered to the bag and required manually removing - which kind of defeats the purpose of the whole idea of the tray really. Oh and if you have razor sharp claws like I do then the bag gets progressively more shredded with each use. I my opinion only, I think that if you have a cat that stands close to edge of box you will have a problem with wee running over the edge which wouldn't be a big problem if the bottom waste tray didn't have a whole in it due to the way the drawer fits into and is secured. Sure, the construction process is fairly straight forward; there aren't many parts, so it's not that difficult to figure it out.

I read reviews which said don't bother with a liner in the top box only get liner for the tray which is what I do and I agree you only need a waste drawer one. From the outside this unit is absolutely HUGE - something my Mum was prepared to get used to if it did a good job.