I agree with getdul981. Daily drying will prevent mold from forming. We have had a Roman shower for 7 years and we run the fan during and after showering. We squeegie the walls and floor, then towel dry walls and floor. We have never had any mold on the walls whatsoever and have never sealer the grout. If we see the redish deposit on the floor grout which you get from water, we spray with a 50-50 bleach/water mix, let sit for 30 minutes, then flush with fresh water. That happens maybe every 3 months max.
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