Amazing, but filter is a bad design.
I got the tray for my one year old boy cat after we found he was peeing everywhere because his litter tray was too small.
We needed something big for him (he is longer than out coonie) so when we read the reviews on this one, we wanted to try it.
We have three cats in total in the house and this is our fourth tray.
It is massive.
I put the hood on the tray but kept the flap on top so it was open for him initially.
He went straight in after some sniffing around and immediately had a poo (well, what else was I going to say in a review of a cat loo?).
He usually would go in, quickly do his business and get out but he was in there for ages happily scratching around.
Since we put it in, he has not peed elsewhere, result!!
It takes one 5L bag of the silica cat litter.
The only down side is that the filter on top is exposed.
Within a couple of days, is was shredded. I think they put catnip in it or something.