iSi of Austria produces these high quality, extremely reliable chargers in their sterile European facilities. iSi chargers are guaranteed to produce extremely rich carbonation with no aftertaste. Each charger contains 8 grams of C02, sufficient to produce 1 liter (or 1 quart) of sparkling seltzer water. These chargers are compatible with any of the soda dispensers featured on our site. Each box contains 10 chargers.