We use the X50 Ultra on an unsealed and rather "wavy" terracotta floor. It works without any problems. However, you have to set the amount of water to "maximum" so that it doesn't just wipe dry after a few metres. In addition, the joints are hardly ever wet because there is not that much water.

We use the x50 with a terracotta floor, but with slightly narrower joints. This works without any problems, but it has lost a mop pad once in 3 months during cleaning.

Hello Reto,
We only have old and new parcel floors. But the Dream X50 certainly doesn't clean inside the joints. And if the terracotta tiles are not all laid at the same height, the wishpads will probably get stuck. It's best to borrow a Dream from a friend, as all models work in the same way. The proof of the pudding is in the eating. 😄. Good luck. MFG Marco