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This is late for this post, but not so for future visitors: Don't waste your money on a ThermoFloat Spa Blanket. I only purchased this in the first place because the retailer discontinued the brand I was using. I have had 3 of them, the 3rd a free replacement because I complained: I was so frustrated that my 2nd corroded just as quickly as my first. Although it has a 1-year guarantee, this thing gets waterlogged in about 2 months, and the ozone corrosion/tearing starts in 3 months. Do use a blanket, but not this one.