A SeltzaHub carbonator that intercepts your sink's supply line to give you the refreshing options of sparkling water. This one happens to also come with the SeltzaTap faucet which lets you choose between regular, boring water or a nice, refreshing glass of chilled seltzer water. Requires CO2 canisters and doesn't come with a water filter. We can't test its water functions or the carbonization, but it did power up when we plugged it in.