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That degree of slope will cause your spa to be off by about 2", more or less, depending on the footprint of your spa. Â our Optima is pretty close to 8'X8'. Not sure I'd want that much tilt- I'm sure it wouldn't hurt anything, I just prefer my spa to be as level as possible. Â People with spas this far out of level often ask about shimming. Â Just food for thought.
1 inch per 10 ft.