My wife and I bought an ISI soda siphon so we could have a regular supply of seltzer (we don't own a car, and it's a drag to lug all that water home on my back!). I understand that the carbonation won't match store-bought. However, it's been hit-or-miss regarding our ability to get good, bubbly seltzer out of it and lately, more miss than hit. Any tips to make consistently good seltzer? Here's the model we bought:
Help would be greatly appreciated!