These pool-top lily pads don't just look cute, they also help warm the pool with their polyethylene film. Best of all, this natural heating solution is far, far cheaper than just about any other heating option since you just need to get a few hula hoops and some film and then use a heat source to attach together.
Find out how to make your own natural heaters over at Homes and Hues: Heat Your Pool Naturally With These Lily Pads
http://en.wikipedia.org/wiki/Circle_packing
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