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Has anyone had problems w/ ice buildup outside the spa on deck or steps in sub-freezing temps? I was wondering if those "drain-thru" rubber mats would work to help from slipping when entering/exiting the tub? I have no idea where to find them locally, but i'm sure you could get them online. I have a nice ice patch where i get out of the tub and am concerned the kids may slip as they are not as cautious of these sorts of potential dangers.