I’m wondering about your experience with them:
- Have they replaced your seltzer/soda buying?
- How much do you use your equipment?
- Where do you get your CO_2 refilled and how much does it cost?
- What flavorings do you use and which are your favorite?
- What equipment did you buy and do you recommend it?
I have found that you don’t need nearly the headroom marked on the bottle. I fill it to about 1.5 cm below the flange below the threads.
I have an old model that I can gently press the button to let it pressurize slowly. That way the water doesn’t splash up into the valve. The more automatic models may make a mess.
Why do you want less headroom? Because it takes significantly less gas to pressurize that smaller volume. I don’t take any data, but the bottles per tank went up as did the water per bottle. YMMV