What is it draining on? It could be rust or just dirt as slate is really just compressed mud.
Here is a picture of Slate that was installed outside. There appears to be a lot of iron in it. If it can be cleaned up is it going to be an ongoing problem for the homeowner? I believe it could be. Is there anything that can be done? Right now he is thinking of taking it out.
Thanks,
Tony Warney
Excel Stone and Tile Care
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