The Ninja Thirsti Drink System is such a fun and refreshing product from a brand all about quality!  This system is so nicely made, and comes with everything needed to produce the most delicious carbonated water drinks.  The Ninja Thirsti is simple to operate-- simply load your flavor cartridge, co2 and place your desired vessel under the spout.  This machine comes with two options for flavor-strength and three options for level of carbonation.  Simply press desired options and enjoy your beverage!  I absolutely love the raspberry flavor, and I prefer maximum carbonation.  This machine produces such crisp and delicious sparking beverages and cuts both cost and calories in our household.  Easy to clean and intuitive in use-- the Ninja Thirsti came to our beverage rescue!