It looks like nice, and 70 dB is very low noise for something compressing air.<p>I am perplexed by the symbols in the video:<p><a href="https://www.youtube.com/watch?v=nr3qhBmbvs0" rel="nofollow">https://www.youtube.com/watch?v=nr3qhBmbvs0</a><p>Water is H2O alright, but air was not O2 last time I checked.