Greenwater Scientific, an Indian biotech company, is selling greenwaterHOME, an indoor air device that uses living microalgae to absorb carbon dioxide and release oxygen. The company says it combines that biological process with a three-stage filter for dust and pollutants, targeting homes that stay sealed during smog season. A NABL test reportedly showed a single unit produces as much oxygen as 64 snake plants. Unlike standard purifiers, which only trap particles, greenwaterHOME is designed to change the CO2 to oxygen ratio in a closed room. The algae culture is visible so users can see it darken as it grows. The product started as a research project at UC San Diego, won awards there, and was developed with manufacturing in Manesar, Haryana. It is available now through the company's website. Questions remain about real world performance. The press release does not specify electricity consumption, CO2 drawdown rate per hour, or maintenance costs over time. Those details would help buyers compare it with a plain purifier plus ventilation.
