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I wonder how different ones limestone is from one part of the world to another. I guess its possible that dans limestone becomes a high "caustic" when wet maybe or some other factor mixing with it A lot of drain cleaners are caustics not acids and they definitely can do some damage
I maintain a property where an old timer concrete engineer lives ill see him on wednesday and ask him. He developed putting air into concrete to make it stronger Long story ! He will definitely know the answer though
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