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If you're only getting 2 years out of the foam covers, I would switch to the bubble type. We sell the bubble type for just this reason. The foam covers cost at least twice as much and don't last longer.Bonibelle - your cover is not forming a vacuum per se. The skirt is wet and sticks to the acrylic forming a water bond. The resistance you feel when opening the cover is this water bond breaking, not vacuum. Many people mistake this phenomenon.
I've read that when they go they leave all the plastic from the bubbles in the water ... is this true?For about $17 one can get a 7'x7' bubble blanket.
I guess I have one last question. If a spa blanket is indeed beneficial, why don't the Spa Manufacturers include one with the purchase? Are there any dealers out there besides hottub.pool_boy who think they are bunk? Just curious.....