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Reverse osmosis became India's default purifier — but for most homes on municipal or tank supply, it removes more than it should and wastes up to three litres for every litre you drink.
Start with a water test
The right purifier depends on what is in your water. TDS (total dissolved solids) is the first number to check. Municipal supply in most Indian cities sits well below 500 ppm, where RO is not required.
Rule of thumb: TDS below 500 ppm → zero-reject filtration. Above 500 ppm or with specific contaminants → talk to an engineer first.
What RO actually removes
RO forces water through a membrane so fine that it strips out salts — including the calcium and magnesium your body needs. Many RO units then add minerals back artificially.
- Up to 75% of input water is discarded as reject
- Needs electricity and regular membrane changes
- Annual maintenance contracts add to the cost
How zero-reject filters work
Multi-stage carbon and ultra-filtration remove sediment, chlorine, odour and bacteria — without wasting water or electricity — while natural minerals pass through.
“Every litre that enters the filter reaches your glass. That is the standard we hold every Shrunga product to.”
The bottom line
Test first, then choose. If your TDS is in range, a zero-reject filter gives you safe, mineral-rich water at a fraction of the running cost.
Not sure about your water?Book a water quality test — report in 48 hours.
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