The iSi Soda Siphon allows you to easily make soda water at home - no more buying plastic bottles that go flat quickly. Use soda water as a base for cocktails, sparkling wine, sparkling tea, and homemade natural sodas. Simply insert a CO2 cartridge and you're ready to make wonderfully fizzy drinks. The Soda Siphon is also an attractive addition to your kitchen decor. Includes 1 CO2 cartridge, which makes 32 ounces of soda water. Imported from Austria.