Sparkling vs. bottled
Soda maker cost calculator
Machine, cylinder, fizz level: what a litre costs and when the soda maker pays for itself.
Basis of the calculation: a cylinder with 425 grams of CO2 carbonates about 60 litres at medium strength, 45 at strong and 80 at light. Tap water costs 0.4 cents per litre including wastewater. The details are in the article What does sparkling water cost?
