One more recommendation. When they pour the concrete pad, make sure it will handle the weight of the spa when filled with water. A friend of ours had a pad put in, and the thickness of the pad was 4". After about a year or so, the concrete cracked in multiple places near his hot tub. I would suspect the thickness should be at least 6" where the spa will sit. You may have to have a thicker pad depending on the weight of the spa.
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