![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqn25M9TYM5MRt9iaHSQWZUCqUOHVG_orNmKukhPf2FSwAXHqpxc8jEis17GXxsPQBwHTyokHBBqU8bFFS3eFSyj1lOY-agsHSORpzf41WmTj3-OdFun4Io18AYRDi_F3sm7vU/s200/ice.png)
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.