Patented zero-reject water purification technology, offered for acquisition
Every litre in. Every litre out. Minerals kept.
A granted Indian patent protects a smart drinking-water container that removes arsenic and fluoride, keeps calcium and magnesium, and rejects no water at all. Around it sits a ready platform: a connected Smart Bottle, five purifier tiers with finalised designs, and the complete media formulation and process know-how.
Put 10 litres in. What comes out as drinking water?
Household RO
3–4 L6–7 litres go down the drain, with the minerals
This technology
10 LNothing rejected, calcium and magnesium retained
The market: unsafe groundwater, costly bottled water and wasteful RO
India's household purification market is built on reverse osmosis, which rejects most of the water it takes in and strips the minerals people need. This technology targets the contaminants that matter and leaves the rest of the water, and its minerals, alone.
9.04%
of groundwater samples exceeded the permissible fluoride limit in the Central Ground Water Board's 2024 annual report, which tested 15,259 locations.
4 states
West Bengal, Bihar, Uttar Pradesh and Assam carry the heaviest arsenic burden, along the Ganga–Brahmaputra floodplains.
₹20–50 a litre
is what urban households pay for packaged water. At 2 litres a day, that is ₹14,600–36,500 a year.
₹0.40 a litre
is the filter running cost of the Smart Bottle: one ₹60 cartridge for every 150 litres.
Expected revenue: ₹38.8 Crore over five years
Management's five-year plan, built at net partner prices, rises to ₹20.1 Crore of revenue in Year 5. The Smart Bottle launches first, purifiers join in Year 2, and EBITDA turns positive in Year 4.
Revenue by year, ₹ Crore
EBITDA, ₹ Crore
Units grow from 500 bottles in Year 1 to 25,000 bottles and 4,000 purifiers in Year 5. Forward-looking management projections, not historical results.
The offer
100% of the company that owns the patent, the designs and the complete platform, for a single consideration. No royalty is payable and the founders keep no equity.
- Asking price
- ₹6.0 Crore
- ≈ US$ 625,000
- What you buy
- 100% of the shares of the owning company
- Core IP
- Indian Patent IN 399934, in force to 2041
- Terms
- No royalty, no equity kept by the founders
The patent and registered design
The core invention is protected by a granted Indian patent with more than fourteen years of term remaining, and the bottle's appearance by a registered industrial design. Both will be held by the company at closing.
- Patent number
- IN 399934
- Title
- “Smart Drinking Water Container”
- Status
- Granted and in force
- Application number
- 202131003741
- Filed
- 28 January 2021
- Granted
- 24 June 2022
- Term
- To 28 January 2041
- Renewal fees
- Paid through 28 January 2027
- Patent office
- Kolkata
- Registered design
- 357902-001, Class 09-01
- Design registered
- 4 February 2022
- Transfer to the company
- Form 16 filed 29 June 2026
The granted specification also describes a domestic purifier configuration built on the same technology. The complete specification and granted claims are shared in the data room.
Five steps between the tap and the glass
The platform combines selective adsorption, mineral retention, UV-C sterilisation and connected tracking in a compact device, protected by a granted Indian patent and a registered industrial design.
Input water
Municipal tap or fresh groundwater, pH 6.0–7.5, TDS below 500 mg/L.
Selective media
Proprietary adsorption media targets arsenic, fluoride and lead.
Mineral retention
Calcium and magnesium pass through instead of being stripped out.
UV-C sterilisation
An automated two-minute UV-C LED cycle keeps water and bottle microbe-free.
Smart tracking
ESP32 with Bluetooth LE: intake, filter life and caregiver alerts in an iOS and Android app.
Zero-reject by design. Every litre that goes in comes out as drinking water, so there is no waste stream to plumb, store or discard.
Proven in the laboratory
Results from independent 2021 laboratory reports and the latest lab-scale study of the current media, measured against India's drinking water standard, IS 10500.
| Test | Feed, mg/L | After device, mg/L | IS 10500 reference | Result |
|---|---|---|---|---|
| Fluoride, current media | 10.0 | 0.18 | 1.0 acceptable | Meets |
| Fluoride, 2021 report | 2.00 | 0.71 | 1.0 acceptable | Meets |
| Arsenic, 2021 report | 0.030 | 0.0047 | 0.01 limit | Meets |
| Arsenic (III), current media, extreme feed | 1.0 | 0.107 | 0.01 limit | 89% removed; staged media for high-arsenic zones |
Minerals in mg/L from the same Kolkata tap feed (26.4 calcium, 5.83 magnesium); each mineral is drawn on its own scale. These are laboratory results, not finished-product certification. Fresh independent testing of the current media and cartridge is under way, and the full reports are shared after an NDA.
A ready product range, from bottle to countertop
The Smart Bottle is the launch product. Behind it sits a five-tier purifier range with finalised bills of materials, from ₹3,520 for Cosmo to ₹8,620 for Signature, and display wireframes ready for firmware development.
Launch product
Smart Bottle
Selective media, UV-C self-sterilisation, 3,000 mAh battery for about 20 days of use, app sync, filter-life alerts and caregiver modules for measured intake.
₹6,000
Purifier, tier 1
Cosmo
Space-saving capsule in Midnight Matte or Sterling Silver.
₹7,500
Purifier, tier 2
Prudent
Unibody Pure Chrome with a touchless single spout.
₹11,000
Purifier, tier 3
Classic
Onyx and Amber two-tone with multi-temperature dispensing.
₹15,999
Purifier, tier 4
Iconic
Executive design in Arctic White, Steel Grey or Blossom Pink.
₹19,999
Purifier, tier 5
Signature
The top tier of the range, with the highest specification.
Price to be set
All purifiers
Common smart display
A shared TFT display showing carbon, UF and pre-filter life across every tier.
5 tiers
Prices are target retail prices.
Why households will switch
The Smart Bottle pays for itself against packaged water within the first year. Adjust the numbers to see the saving over five years.
Packaged water price
Smart Bottle cost: ₹6,000 bottle, a ₹60 cartridge per 150 litres, and ₹300 a year of upkeep from Year 2. At 2 litres a day this matches the management model of ₹6,300 in Year 1 and ₹600 a year after.
Five-year saving
₹64,300
Why a strategic buyer should move now
Protected IP and know-how
A granted patent in force to 2041, a registered industrial design, and the media formulation and process know-how that a competitor would have to rebuild from scratch.
Years off the development clock
More than four years of research, laboratory validation, patenting and product design are done. A buyer starts at engineering handover, not at the whiteboard.
A segment RO cannot serve
Zero-reject, mineral-retaining and contaminant-selective in a portable form. It fits households that want safe water without the waste or the flat taste.
A second product line, already designed
Five purifier tiers with finalised BOMs and display designs give a direct path into the countertop market from Year 2.
A natural fit for
How it compares
| Capability | This technology | Typical UV-C bottles | Household RO purifiers |
|---|---|---|---|
| Removes arsenic and fluoride | Yes, selective media | No, UV sterilises only | Yes |
| Keeps calcium and magnesium | Yes | Not applicable | Mostly stripped |
| Water rejected | None | None | Typically most of the input |
| Portable | Yes, smart bottle | Yes | No, fixed units |
| App and caregiver tracking | Firmware and app built | Varies | Limited |
What ₹6.0 Crore buys
100% of the shares of the owning company. All intellectual property and assets are held in the company at closing, set out in a full asset schedule. No royalty is payable and the founders keep no equity.
Patent and design
Indian Patent IN 399934, registered industrial design 357902-001 and the trademark.
Formulation and process
Adsorption media formulations, process SOPs, and the complete laboratory data package.
Product engineering
Smart Bottle CAD and BOM, plus finalised BOMs and TFT wireframes for five purifier tiers.
Digital stack
ESP32 firmware, iOS and Android app, cloud backend and caregiver portal.
Express interest
Email RKG Software with a short profile of your organisation.
NDA and data room
Patent papers, lab reports, CAD, BOMs, firmware and the full financial model.
Meet the founders
A working session with the inventors on the technology and the plan.
Due diligence
Your technical, legal and IP review, with the founders on hand.
Close
Definitive agreement, payment and share transfer.
Questions buyers ask
What exactly is for sale?
100% of the shares of the company that owns the technology. At closing the company holds Indian Patent IN 399934, registered industrial design 357902-001, the trademark, the adsorption media formulations and process SOPs, the laboratory data, Smart Bottle CAD, finalised BOMs and display wireframes for five purifier tiers, and the firmware, app, cloud backend and caregiver portal.
What is the asking price?
₹6.0 Crore (approximately US$ 625,000 at about ₹96.25 to the US dollar on 5 October 2026) for 100% of the shares, with no royalty and no equity retained by the founders. Applicable taxes and stamp duty are extra.
Is the patent granted and in force?
Yes. Indian Patent IN 399934, titled “Smart Drinking Water Container”, was filed on 28 January 2021, granted on 24 June 2022 and is in force, with a term to 28 January 2041. The transfer of the patent into the company has been filed with the Indian Patent Office, and renewal fees are paid through 28 January 2027.
What stage is the product at?
Laboratory validation is complete and a mini-prototype has been built; a full-scale working prototype is under fabrication. BOMs and TFT display wireframes are finalised for all five purifier tiers, ready for firmware development, and fresh independent testing of the current media is under way.
How much more investment will the business need?
Management estimates about ₹4–4.5 Crore of follow-on funding for tooling and working capital, subject to final supplier quotations and volumes. In the revised plan, EBITDA turns positive in Year 4 and reaches ₹4.2 Crore in Year 5.
How do I take this forward?
Email director@rkgsoftware.in with a short profile of your organisation. RKG Software Pvt Ltd will send the information pack, arrange an NDA and data-room access, and introduce you to the founders.
Request the information pack
Tell us a little about your organisation. We will send the information pack, arrange an NDA, and introduce you to the founders.
