Archive · 20 Aug 2026
MIT-Born Tap Filter Challenges India’s Reliance on RO Purifiers
A team connected to MIT has made a small filter that attaches to a water tap.
It is called Jal Kavach and costs Rs 899 in India.
The team says it can remove 99.9 per cent of bacteria from water.
It does not need electricity and does not throw away extra water.
The filter uses several materials, including activated charcoal, to clean the water.
It also removes things such as sand, rust, chlorine, bad smells, and some organic compounds.
The filter works for different lengths of time depending on how dirty the water is.
The team hopes people will use it instead of RO purifiers, but many consumers still trust RO more.
DetoXyFi’s Jal Kavach tap filter sells in India for Rs 899.
The filter reportedly removes 99.9 per cent of bacteria without electricity or water waste.
Its composite membrane uses activated charcoal to reduce chlorine, odors, and organic compounds.
The filter can process about 7,500 litres, lasting four months to over a year depending on water quality.
DetoXyFi reported revenue of Rs 5 lakh in 2025 and Rs 20 lakh the following year.
- Who
- DetoXyFi, led by MIT professor Rohit Karnik and including co-founder Dhananjay Goel and researcher Vishal.
- What
- The startup is developing and selling Jal Kavach, a tap-mounted water filter.
- When
- The product went on sale in June 2025; the article also refers to an EAW Global Aqua Expo held in early August 2026.
- Where
- The product is being marketed in India, after earlier versions were tested in Uganda, Madagascar, and Kenya.
- Why
- The team aims to provide affordable drinking-water filtration while avoiding the electricity use and water waste associated with RO purifiers.
Jal Kavach’s advantages
RO purifiers’ established appeal
Resource use
Jal Kavach’s advantages
DetoXyFi says Jal Kavach requires no electricity and does not waste water.
RO purifiers’ established appeal
The team says RO purifiers consume substantial electricity and can waste three litres of water for every litre produced.
Consumer trust
Jal Kavach’s advantages
DetoXyFi argues that its filter can offer an affordable alternative and says reception has improved with advertising.
RO purifiers’ established appeal
Many Indian consumers remain accustomed to RO systems and initially did not trust another filtration method.
Product consistency
Jal Kavach’s advantages
The team says the filter can process about 7,500 litres and signals replacement through reduced water flow as its pores clog.
RO purifiers’ established appeal
The company acknowledges that filter life is not universal and varies from four or five months to more than a year depending on how dirty the water is.
- Product
- Jal Kavach tap filter
- Price
- Rs 899 in the Indian market
- Reported bacterial removal
- 99.9 per cent
- Water capacity
- About 7,500 litres per filter
- Expected lifespan
- About four or five months to more than a year, depending on water quality
- Sales channels
- Amazon, Blinkit, Flipkart, JioMart, and other platforms
- Reported revenue
- Rs 5 lakh in 2025 and Rs 20 lakh the following year