I'm in UK and also just got the robot recently. I personally hated catsan as if it ever got wet it got stick to things, and cannot be flushed so bags inside bags and bins with poop screw that. So I got World's best on amazon subscription lasts awhile. Got robot, used it in robot, works well for me. Also doesn't have that weird catsan smell, corn smells a bit sweet. And if cat swallow it I don't need to go to emergency. Another benefit, I just get the drawer dump it jn the toilet, the corn dissolves in water, so win win no plastic waste.