Japan Deluxe Stainless Steel Soda Siphon (1 Liter)

Sparkling Water Made in Steel, Not Plastic

The popular countertop carbonation machines all share one quiet flaw for a low-plastic kitchen: they carbonate your water inside a plastic PET bottle.

This soda siphon does it differently. It is a classic Japanese-made stainless steel siphon that holds a full liter of water in a steel chamber, takes a standard 8-gram CO2 charger in the head, and lets you carbonate cold water on demand with a shake and a press, no electricity and no plastic bottle. Pull the lever and you have fresh sparkling water poured straight into your glass, ready to drink on its own or to build into Italian sodas, spritzers, and cocktails.

For a non-toxic kitchen, the appeal is the material your water actually sits in.

The chamber is stainless steel, an inert surface, rather than the plastic bottle a typical home carbonation machine relies on, and the whole thing runs without a motor or a cord. It is compact, it lives happily in the fridge so your water is cold when you carbonate it, and the chargers it uses are simple recyclable steel cartridges.

True Shift Score: 8.5 / 10

This is our own assessment, not a lab result or a certification.

It scores high because your water carbonates and sits in a stainless steel chamber rather than the plastic bottle a typical home machine uses, with no electricity involved, and it pours straight into your own glass. It sits a little below the fully inert manual tools in this collection for honest reasons: like all siphons, the head valve and seals include some plastic or silicone, and it relies on single-use CO2 chargers. For plastic-free sparkling water, it is an excellent choice.

The Honest Tradeoffs

A few honest points.

1. While the chamber is stainless steel, the head is a mechanism, and as with essentially all soda siphons, the valve, seals, and internal tube include some plastic or silicone components, that is the nature of a pressurized dispensing head, so this is not a single-material steel object from top to bottom. 

2. The carbonation comes from single-use CO2 chargers, which are recyclable steel but are still a consumable you buy and replace, one per fill. It carbonates plain water, so any flavor is what you add yourself, which is a feature if you want control and a chore if you wanted flavored soda out of the tap. 

3. And being an imported traditional design, the instructions can be sparse, so the first fill or two is a small learning curve. 

4. None of this is a flaw, it is the honest profile of a real metal soda siphon.

How We Evaluate Appliances

1. We look at the part that matters most, the surfaces your food and drink actually touch, and ask whether they are inert materials like glass, stainless steel, and wood, or whether they are plastic and nonstick coatings. 

2. We favor manual and non-electric tools wherever they can do the job, since they tend to keep plastic out of the food path entirely, and where an appliance does involve plastic or a coating, we say so plainly. 

3. Few appliances are ever perfectly plastic-free, so the goal is keeping the most plastic out of what you eat.