# MIT professor-backed tap filter and twin sisters’ plant-based filter tackle India’s water woes

2026-08-20T22:01:13+00:00 | Technology | Indian Opinion Desk

Corroboration: 2 independent outlets

Two new water filtration technologies from India offer affordable, electricity-free alternatives to traditional RO purifiers. DetoXyFi, a startup led by MIT professor Rohit Karnik and including 22-year-old IIT Jammu graduate Vishal, has launched the Jal Kavach tap filter at Rs 899. The filter removes 99.9% of bacteria, uses no electricity and wastes no water. It has generated Rs 20 lakh in revenue in 2026 after Rs 5 lakh in 2025. The filter, using a composite membrane with activated charcoal, lasts up to 7,500 litres and is sold on Amazon, Flipkart and Blinkit. ThePrint reports the team aims to replace RO purifiers in Indian homes, though it faces consumer trust issues. Separately, Delhi-NCR twins Naina and Nayantara Singh, Class XII students, developed Aqua Sattva, a plant-based water filter using okra, fenugreek and rice husk. Tested at IIT Delhi, it removes up to 93% of PFAS chemicals and substantially reduces microplastics. A pack of 10 sachets costs Rs 100 and requires no electricity or plumbing. The Times of India reports the sisters are awaiting a patent for their innovation.

## Indian Opinion Analysis

Both the sources present the innovations as promising, but neither subjects them to rigorous scrutiny. ThePrint focuses on the startup's journey and the young engineer's motivation, framing DetoXyFi as a credible challenge to RO purifiers, while lightly noting consumer trust as a hurdle. The Times of India highlights the sisters' achievement as a low-cost, scientific breakthrough, without questioning scalability or real-world efficacy. The middle ground is that both filters address genuine problems, RO waste and PFAS contamination, but remain early-stage: DetoXyFi has modest revenue and a short track record, while Aqua Sattva awaits a patent and independent field testing. The key numbers to watch are DetoXyFi's sales growth and Aqua Sattva's patent status.

## Coverage

Coverage: 2 sources, 2 neutral
- theprint.in (neutral report) <https://theprint.in/feature/mit-professor-startup-solve-indias-drinking-water-problem-tap-filter/3020879/>
  Focuses on startup's technology and team story without endorsing or criticising government.
- timesofindia.indiatimes.com (neutral report) <https://timesofindia.indiatimes.com/science/delhi-ncr-twin-sisters-turn-okra-fenugreek-and-rice-husk-into-a-rs-100-electricity-free-water-filter-iit-delhi-tests-show-up-to-93-removal-of-pfas/articleshow/133434339.cms>
  Presents student innovation positively without government framing or criticism.

This story was synthesised by AI from the 2 sources linked above.
Updated: this story now draws on 2 sources. Last updated 2026-08-23T11:15:49+00:00.

Tags: DetoXyFi, IIT Delhi, MIT, Rohit Karnik
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