The archive · Product Ideas · Product decision · 2024
Filsa turns the bottle cap into a water filter — wins El Ojo 2024 Innovation Grand Prix
Ogilvy Colombia and Filsa turned the universal bottle cap into a biodegradable purifier; 1,000 caps can process 720,000 liters of safe water a year.
Filsa Colombia
What it had to solve
Around 3.7–4 million Colombians, especially desert communities like the Wayuu in La Guajira, lacked safe drinking water while a severe drought pushed reservoirs to historic lows. Conventional purifiers were too expensive and complex for remote areas; Filsa, a water-filter company, needed a tool that worked where infrastructure did not.
How it works
In 2024, Colombian water-filter company Filsa, Ogilvy Colombia, Baylor International and the Colombian Red Cross released Filter Caps: a 3D-printed bottle cap that turns an ordinary plastic bottle into a portable water treatment plant. The cap fits any standard PCO 28mm thread and links two bottles, purifying water as it flows from one to the other.
The problem was stark: an estimated 3.7–4 million Colombians lacked access to safe drinking water, concentrated in desert regions such as La Guajira where drought made the situation worse. Household purifiers were too expensive or too complicated, so the team attacked the obstacle itself, making a functioning filter the size of a cap.
Inside the cap, layers of metals, minerals and natural substrates retain bacteria and impurities, reducing them by 70%, eliminating 90% of heavy metals, and adding minerals, alkalinity and hydrogen. The corn-starch resin casing is compostable, the whole device weighs 28 grams, and it promotes reusing plastic bottles rather than discarding them.
The thousand caps distributed with humanitarian partners carry the capacity to produce more than 720,000 liters of safe water a year, and early units reclaimed over 300,000 liters in two months. The idea then swept the award circuit, from two Gold Lions at Cannes to El Ojo's Innovation Grand Prix.
Why it lands
- It attacked the real barrier — costly, complex purifiers — by redesigning the cheapest, most universal object: the bottle cap.
- The universal 28mm thread means it works on any bottle with no electricity, training or maintenance.
- A compostable corn-starch casing turned a plastic problem into a biodegradable product.
- Distribution through the Red Cross and Baylor Foundation gave the project humanitarian reach and credibility.
- Concrete numbers — 70% impurity reduction, 90% of heavy metals removed, 720,000 liters a year — made the claim measurable.
What it did
The 1,000 caps carry capacity to process more than 720,000 liters of safe water a year, and the first units reclaimed over 300,000 liters within two months. Filter Caps won El Ojo 2024's Innovation Grand Prix plus eight golds, two Gold Lions at Cannes in the Sustainable Development Goals category, and a D&AD Future Impact Pencil.
What you can take
When the obstacle is the cost and complexity of the solution, redesign the cheapest universal object instead of advertising around the problem — compatibility lets the idea scale.
Since then
Filter Caps kept collecting recognition through 2024: two Gold Lions at Cannes, a D&AD Future Impact Pencil, and a slot in WPP's global holding-company showcase, alongside its El Ojo haul. The project was positioned as a template for disaster relief and remote communities beyond Colombia, with the design open to scaling to any region facing the same water problem.
Sources
- El Gran Ojo Innovación premia proyecto sustentable de Ogilvy Colombia
- Filter fresh
- Global Ads Spotlight: How a tiny filter made a big splash in Colombia
- Ogilvy named Network of the Year at 2024 D&AD Awards
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