The Breeze cat litter system?

That's what I was afraid of, Mary.  And I haven't seen one yet other than on line.  It says they have the tall wall surround thing.  My big male needs a deep box because he doesn't always squat down.  With some of those low boxes, he's going to pee right over the edge every time.  The boxes I use are all very deep.  In fact one of them isn't even a real cat box, it is a rubbermaid container that is big and tall enough for him.

I did try pine pellets once, and they smelled great fresh out of the bag.  But when the pee hits them, they kinda explode into sawdust that looked like it was going to dry out and fly everywhere.  I pulled it within two days when I started picturing sawdust with dried pee particles floating around. They did use it without complaint though.  They are really good about changes in litters, changes in boxes, changes in location of boxes, and really, anything new in their lives, they go with the flow.

Well, other than my smallest female.  She was bothered when I brought the puppy upstairs to sleep in my bed.  She has always slept on my stomach at night and was a bit jealous. She is over it now, but I discovered a few months later that the little cat is peeing on the dog's potty pads.  I keep the potty pad on the shower floor and leave the shower door ajar so the pup can go in and use it during the night.  I walked in there one day when the little cat was walking out of the shower.  I thought - no way.  But I opened the door and looked and there was a fresh peepee spot.  The dog was asleep on the bed.

I didn't know what that meant for her so I had her checked out at the vet.  She is fine, she just likes peeing where the dog goes.  The other two use one of the litter boxes, and she will too most of the time, but almost daily, I see her running into the shower and I spy to check and she's peeing in there again.  I guess it could be a lot worse, it could be on my bed or carpet or couch or something.

And I do have more than one litter box, Regina Phalange.  I have three.  I have two upstairs and one in the garage.  I rescued another cat last year and he uses the garage box.  My other three cats were from the same litter and have been together from the day they were born.  They don't mix with the new guy. And the new guy has never attempted to come up the stairs.  So I have upstairs kitties and a downstairs kitty.  And the upstairs kitties all choose to use the main box in my bathroom.  They pretty much stay in my master bedroom all day.  And they sleep in my bed with me at night, so that's their main box.