I purchased this so I don't run out of seltzer. I works as advertised and provides 4 mugs of seltzer before refilling. I have uses it with juices, half juice in a glass and half seltzer. A very refreshing summer drink. Make sure you shake it 15 to 20 times when you take it out of the frig. I did as the directions call for (three), not enough fizz. It's worth the money and when you buy the bulk cartriges, its a great alternative to buying bottles in the market.