Cleaning "scale" off of unsealed slate

[river-wear]

Hi,

I have natural slate - the kind with a rough surface - along the water line of my pool. (Yes, I've heard the horror stories about cheap slate dissolving, and no, this is not one ofthem.) I've had it for two years and it still looks quite good. However, over time it has collected some calcium/scale build-up just above the water. The tile has never been sealed.

Does anyone have any suggestions for removing the scale deposits? I'm hesitant to use something like CLR, not only because I'm not sure if it's okay on slate but also because I don't want to mess up the pool water.

Thanks!
Michele

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[Davestone]

I would just use a scum and scale remover which would be an acidic product, and rinse it well.Most slates won't be harmed by this but you would want to test a small area with a few drops of it and see if it works without harming the stone.A stiff brush and rubber gloves would help. :bow: