I have a hot tube in my lanai for 8 years. Yes it has begun to form a type of mold around the bottom edge of the tub where it meet the concrete. Mold forms from dirt and moisture. It will also form under the step. It is pretty easy to keep the inside of the tub mold free but the floor under it is harder. We power wash the lanai 2 or 3 times a year but we live on a busy street where the lanai gets dirty quickly. I love my tub so maintaining it is worth it.
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