system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the ice that comes out of my fridge's ice maker white, or cloudy, while the ice you get at a restaurant or bar is clear?
gpt
The white/cloudiness is mostly small bubbles of air that was previously dissolved in the water when it was a liquid. Residential ice makers form the top down. The top layer of water freezes and slowly the ice grows downwards into the mold. This trap the air that was previously dissolved into the water. 

Commercial ice makers form ice from the bottom up, this lets the gas escape. Additionally they may use water that was additionally filtered through a carbon tank to remove off flavors, water softener to reduce calcium and other minerals, or reverse osmosis to make it "pure" water.

Boil and cool the water before freezing it, and you'll get almost clear ice.