The secret to making crystal clear ice is made very simple in this demonstration video: just boil the water twice (cooling it in between) to get out any impurities, and your ice will come out clear instead of cloudy. Filtered water also seems to be a key factor, although it seems to me that water boiled twice would probably be good enough.

Reference: http://lifehacker.com/software/video-demonstration/make-clear-ice-313194.php

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