Hidde Koch
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http://www.dailystrength.org/people/3405345/journal/7688941
http://www.kiwibox.com/floodroll63/blog/entry/110375931/solar-pool-heating-is-the-best-way-to-save-energy/?pPage=0
http://kampusagi.com/index.php?p=blogs/viewstory/245960
http://www.flixya.com/blog/5581383/Solar-Pool-Heaters-Zero-Ope...