I wanted ice cubes that look like clear glass. To get them: 1. Plugged it in Ice not clear. 2. Added a water softner, Ice not clear. 3. Added a reverse Osmosis unit. Voila! Perfection. PS RO unit alone Not clear. Works great, makes lots of ICE that looks great and tastes great. Put some cubes in a glass and let them melt for the worlds purest water. I had other units before, none compare!