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I recently laid a new concrete shower pan, and went around the drain radially, which created some circular ridges.

I'd like to make the pan as smooth as possible, but these ridges are currently 1/8" to 1/4" high. How can I level these out, and do I even need to worry about it if I'm laying thinset when I put my tile down?

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You probably don't need to concern yourself. The thinset plus tile should smooth out the imperfections just fine.

If you really want to remove them, you'll probably need to use a concrete grinder. But that's pretty expensive. As a "lightweight" alternative, a 4" angle grinder with a masonry wheel would knock the top off of the ridges. But it would take a lot of time and make a lot of mess to really remove much material that way.

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