Future Water
Regeneration at Home
WOTA Unit is a residential water
recycling system
designed to eliminate your water
challenges—whether it’s shortages,
quality concerns, or wastewater management.
By regenerating up to 97%* of
wastewater from showers, kitchens,
and washing machines
into high-quality water, it dramatically
reduces the dependence on
rainwater and utility supply.
- ※1 * Actual results may vary depending on
usage and conditions.
Life with the WOTA Unit
The usage estimates shown are based on a total storage capacity of 650L — consisting of the WOTA Unit itself (150L) and two optional 250L tanks — and assume average household water use for a family of three (according to our internal research).
Water Volume & Number of Uses Chart (Gallons)
– Caribbean
- Dish Washing: 5.3 gal / 32 times
- Toilet: 4 gal / 43 times
- Shower: 21 gal / 8 times
- Laundry: 40 gal / 4 times
features
Bringing “small-scale water infrastructure”
to the homes in your community
We can recycle up to 97%* of the wastewater generated at home
—from the bath, kitchen, washing machine, toilet, and more—
back into safe water.
By making that water reusable for bathing, washing dishes, doing laundry,
and flushing toilets,
you can live free from worries about water shortages or water quality,
even without being connected to conventional water and sewer systems.
* The actual recycling rate may vary depending on your usage environment and how water is used.
-
Clean Water
WOTA Unit provides clean,
safe water that meets WHO Guidelines for drinking-water quality.
Say goodbye to concerns about bacteria, viruses, or harmful chemicals. -
Water Resilience
Even in times of drought or infrastructure failures,
WOTA Unit can continue operating as long as electricity is available.
This allows you to live independently of local water infrastructure issues. -
Smart Maintenance
You can monitor available water levels
and receive maintenance notifications through the dedicated app.
Managing your daily water supply has never been easier.
monitor water usage
- Current available water
- Estimated time to water recovery
- Remaining uses based on
current water level - Check remaining rainwater tank level
How It Works
* Actual results may vary depending on usage and conditions.
In pilot testing conducted on-site at the WOTA Lab in Antigua and Barbuda, a 95% result was achieved.
Rainwater collected from the roof is stored in a tank.
Rainwater and greywater undergo biological treatment, membrane filtration, and disinfection using UV light and chlorine, ensuring safe, drinkable water. Biological treatment uses microbes (see right) to decompose organic matter, common in large sewage plants.
Showers, kitchens, washing machines, and toilets can be used just like in a conventional home. While water recycling takes a little time, the system is designed to ensure a steady supply throughout the day.
All greywater from showers, kitchens, and washing machines is collected and treated by the WOTA Unit. To maintain optimal system performance, avoid discharging chemicals or food waste that could overload microorganisms or filters.
Wastewater from toilets is directed to a septic tank, ensuring complete separation from the regenerated water and preventing any risk of contamination.
Any water loss throughout the process is
replenished from the storage tank.
technology
What ensures the safety of the WOTA Unit is our proprietary autonomous water treatment control technology. The system monitors water quality, water pressure, and other parameters using sensors, and automatically controls the operation of the equipment through algorithms to maintain optimal system conditions. Thanks to this technology, advanced water treatment —typically performed in large-scale water purification or sewage treatment plants under the supervision of professional operators—can now be carried out in ordinary households. The quality of water supplied by the WOTA Unit complies with the WHO Guidelines for drinking- water quality.
specs
| Size | W 1680mm (66.14in) × D 780mm (30.71 in) × H 1400mm (55.12 in) |
|---|---|
| Main unit weight | 166kg (when dry) |
| Source Water | Greywater from showers, sinks, laundry machines (up to 97% regenerating,with rainwater replenishment1) |
| Treatment Capacity | 438 –720 L /day (116–190 US gal /day) |
| Use Environment | 0℃ (32°F)* to 40℃ (104°F), Tested for corrosion and strong winds (equivalent to Category 3 hurricanes). |
| Power | 110 V / 60Hz 105 W |
* If the installation site is susceptible to freezing conditions,
please select the cold-climate specification option.
WOTA Unit is currently under development for mass production with support from the New Energy and Industrial Technology Development Organization (NEDO), a national research and development agency in Japan.
Please note that the specifications and performance are subject to change as development progresses.