How We Research
Every guide on RosyRoutine starts with one question: will this product work for the person who is shopping for it? For our sparkling water maker guides, that means your counter, your CO2 and bottle routine and how much seltzer you drink.
Here is how we answer it.
1. We start with how you drink seltzer
How often you carbonate, how many bottles you fill and how much counter room you have decide which machine fits. A small manual machine and an electric one suit different habits.
We check the size and footprint, the bottle sizes a machine takes and whether it works with glass or plastic bottles. When your kitchen or routine limits the choice, we say what to measure.
2. We compare specs and features
We look at the carbonation controls, whether the machine is manual or electric, the bottle types and the cylinder connection. For SodaStream models we note whether a machine takes screw-in or Quick Connect cylinders.
SodaStream, Aarke and the other makers describe their machines in their own words, so we name the brand for every claim. We also note the warranty terms the maker lists.
3. We look at running costs
A machine is only part of the cost. We look at how cylinder exchange or refills work, how often bottles need replacing and what flavors add.
We describe the maker's own exchange and refill options. We leave out home refill hacks and adapters.
4. We look at buyer feedback
We read through what buyers report after using a machine. We look for patterns, like leaks at the cylinder connection, loud pumps, bottles that need replacing or flavors that fizz over.
One angry review doesn't sink a product. A pattern does.
5. We score each product
Our score weighs specs, features and buyer feedback against what you're shopping for. A product that's great for one kitchen may score lower in a guide written for another.
Scores spread out on purpose. A 10 is rare.
6. We keep pages up to date
Products change, and some disappear from stores. SodaStream sells many machines and bottles with similar names, so we check each model name and we only link new units.
When we update a guide, the "Updated on" date at the top changes with it.
What our picks are not
Our picks are research, not lab tests. We don't claim to have used every machine we cover.
Sparkling water makers use pressurized CO2 and bottles. Always follow the maker's instructions, bottle dates, fill lines and handling rules, and we never call a bottle or machine "safe" ourselves.
We don't promise that any machine will fit every kitchen or every cylinder. We make no health claims about carbonated water, and when a maker makes a claim, we label it as the maker's claim.