A photo would definitely help. It's a "lip" on the edge of the stone itself, and not the grout or edge of the drain standing slightly proud?

A photo would help, because if the grout or drain flange is flush or in plane with the edge of the slate, and the edge of the slate has a lip, then it's more like there's a cleft or divot in the slate that needed to be addressed rather than the edge of the slate having a lip.

Will getting rid of the slate lip still leave the grout high? Or the edge of the drain high?

My only other comment would be...this is a steam shower right? I'd have opted for something other than slate for the floor of a steam shower. A ceramic or porcelain, perhaps.

Without seeing anything, my guess over the phone is if you can just sand it with a belt sander, you are done! Do you need to remove more than 1/16th" ? Keep it wet and it'll sand down the stone without making much dust. Is the channel drain made of stainless?

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The Pimple

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I should have the LED lights in by days end tomorrow.

I love this shower! We backed down the flow from our new supply lines source. We installed two 1" Globe Valves and I found it took 11 wrist rotations to open fully or close it off tight. I calculated we needed to ristrict the water by 60 percent to make this 'Sculpture" safe. I gave the valves 4 wrist turns from a closed position and fired up the system. No change the shower was still flat out.

Next 2.

Next 1.

Next 1/2

Next 1/4 turn. Amazing. I only opened these valves a 1/4 turn and the shower works like your every day unit. With the "Big Rain" the water is softer and doesn't belt you.

Hope you like it.

a little rotary tool.

That might be a great idea! I have a few special tile tips for my Dewalt. I have a few spare tiles on-site.

I'll give that little tile bit a go! - Solid Idea!

Thanks.

John