The M-Spa hot tub round inflatable bladder helps water heat retention but also keeps unwanted rainwater out. Please inflate the bladder and rest it on top of the water (under the cover), this provides better heat preservation and prevents sagging so the rainwater can runoff. Please note this will only fit 6 man spa. We also have a Square version for the Alpine  Inflatable cover bladder to fit 6 person spa Inflatable bladder provides better heat preservation and rain outflow. Put the bladder onto the spa pool underneath the cover. Suitable for any 6 person M-Spa round hot tub.
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