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Because your deck is not level? Or because the infamous Tub Girl is in the spa?Term?
okay, that's nasty....I'd be darned tempted to add a shocking dose of dichlor while they were still IN the tub, in hopes of killing off their personal cooties, too.
If you look closey at Why Not's 2nd pic, you'll see there are two people in the tub.
Garden hose seems to be stuck into the tub - wonder if it is filling or draining the thing? 8-)