I a looking to put tile down where I currently have carpet but after pulling the carpet up and expecting to see just concrete slab, I am seeing a thin layer of white material. This material is rougher than the slab and doesn't feel like or look like a paint. It feels more like a mortar. Question is, what is this and can I apply mortar and tile on top of it or do I have to remove it. Any help would be appreciated.
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