Today I have also been appreciating our lovely soda siphon. It has been resting neglected and half full in our refrigerator for at least a couple of weeks. Today I had a craving for elderflower syrup and soda, but was sure that by now all the carbonaterific virtue would have gone out of the siphon contents. But no! It was perfectly fizzy in every way (how many ways does it take, I now wonder). It was all very exciting. Thanks, Mark!