The sodastreams have a better cap for sure. They suggest 2 rounds of carbonation IIRC, and I do 3 to achieve the same levels. Shaking is a must because increase

The sodastreams have a better cap for sure. They suggest 2 rounds of carbonation IIRC, and I do 3 to achieve the same levels. Shaking is a must because increased surface area exposed to CO2 increases absorption into the liquid, although I only shake for 5 seconds on each round. This is done with sodastream too IIRC. I also use the 750mL bottles instead of 2L bottles. Also higher pressures are better obviously. Another tip is to use cold water because that apparently absorbs CO2 better. You can also carbonate wine. My girlfriend was very excited to be able to buy cheaper white and rose wines and just carbonate them instead of buying more expensive bottles of sparkling wine.