Solar blankets most definitely work and help heat your pool. They are one of the easiest and most cost effective methods for heating. How much do they heat your pool? Thats dependent on a lot of variables, such as initial pool temperature, sunlight, temperature fluctuations (day vs night), pool size, etc.
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I tried to buy an MP3 from Amazon, went through the process, put in card details, then after all that it told me I could not buy it as I was outside the USA. Unless that has changed, I guess you can't buy from them.