These carbon dioxide cartridges do not have a tread but go with common soda siphons. They are filled up with natural carbon dioxide. In general one cartridge lasts for one litre water.
They are available in packages with 10 pieces.
Please remind that these carbon dioxide cartridges are not refillable.
The consumed cartridges
The Soda Siphon is back in fashion. Not only because of the current retro trend for classic products from the 60s and 70s, but mostly because of the fizzy, refreshing effect of soda water. Soda water is pure water carbonated with CO₂ and thus turned into a unique, natural sparkling drink.