Why we don't sell flavor cartridges

We almost shipped flavor cartridges last summer.

They sat on a desk in our Singapore office for six weeks: little white pods, twist-lock fitting, four flavors to start. Vendor quote: $0.18 per cartridge. Retail at $0.79. Margin too good to argue with. Twelve cartridges per K1 station per day, conservatively, would cover the cost of the unit inside fourteen months. The numbers worked.

We killed it anyway.

Here's the math we didn't put in the deck. A 200-station deployment, twelve cartridges a day each, runs to 876,000 cartridges a year. Even with the most optimistic recycling rate any cartridge program has ever hit (Nespresso's, around 30% in jurisdictions with collection programs — closer to 5% globally), that's hundreds of thousands of cartridges in landfill. It's the exact problem we built Aquivio to solve. Single-use plastic, just smaller and prettier.

The "but it's recyclable!" argument doesn't survive contact with real-world disposal. PET water bottles are recyclable too, in theory. The actual rate is 9% globally. Cartridges are worse — they're small, often multi-material, and the operator (a hotel housekeeper, a gym staffer) has zero incentive to separate them. They go in the bin.

We considered the obvious workaround: a take-back program. Customers ship spent cartridges to a regional hub, we recycle in bulk. Two problems: (1) the ones who care will participate; the ones who don't won't, and the ones who don't are most of them. (2) The shipping carbon cost — small parcels, individual addresses — eats most of the saving you get from recycling in the first place. We ran the numbers. It's a wash, environmentally, with extra logistics overhead.

So instead we did the harder thing. The K1 has a refillable infusion reservoir, refilled from a 5L concentrate pouch, refilled from a returnable 20L drum. Three layers, all reusable. The drum returns to us, gets sterilised, gets re-issued. Operators love it because it cuts their inventory by 90%. We love it because it's not a lie when we say "single-use plastic-free."

It costs us margin. The drum logistics alone is several percentage points we don't get back. Investors have asked, more than once, why we don't just do cartridges and "fix" sustainability later with carbon offsets. The answer is that we don't believe the offsets are real, and we'd be embarrassed to sell something that contradicts the reason the company exists.

If you ever see Aquivio cartridges on a shelf, something has gone badly wrong upstream of me. We won't.