WATA technology enables the local production of sodium hypochlorite (chlorine) for water disinfection and treatment purposes.
WATA technology is a portable device that allows users to make their own chlorine using just water, salt, and electricity. The system converts a measure of salt and water into sodium hypochlorite (bleach) by a process called electrolysis. It is designed by the Antenna Foundation based in Geneva, Switzerland. This product is commercially available and comes in 5 different sizes depending upon the quantity of active chlorine made from 0.5 to 60 liters.
Target region for this product includes; Burkina Faso, Cambodia, Comoros, DR Congo, Guinea, India, Mali, Nepal, Pakistan, Rwanda, and Zambia.
417 USD (380 CHF) Converted as of 2020 August for WATA standard size but can range from 150 – 5,000 USD depending on the size of the WATA product.
Goal 6: Clean water and sanitation
Target users include communities, schools, medical centers, and households while the target buyers include humanitarian organizations and governments.
The manufacturing process is based on Switzerland with Swiss suppliers. One of the main suppliers is a social venture employing only people suffering from a disability (psychological, mental, physical).Correspondence with manufacturer
The electrolysis technology is not patented but the brand and design are trademark protected.Correspondence with manufacturer
As of 2019, more than 5,000 products have been distributed.
Active chemical and concentration (%) of the product (not the concentration of the treated water)
Form of the chemical disinfection
Does the water flow through a treatment system or does it remain in a container?
Is the dose of the chemical administered automatically or manually?
Manufacturer-specified dosing quantity
Manufacturer-specified time until water is potable, measured in minutes
Remaining level of chemical concentration after manufacturer-specified contact time
Laboratory-evaluated log scale removal rate of bacteria
Laboratory-evaluated log scale removal rate of viruses
Laboratory-evaluated log scale removal rate of protozoa
Reduction levels of heavy metals and/or arsenic through this treatment system
How long can the treated water remain protected and safe to drink?
Manufacturer-specified maximum level of inlet turbidity (NTU)
WATA is an electronic device used to produce active chlorine for disinfection out of salt, water, and electricity. The WATA products produce the sodium hypochlorite equivalent to 6 g/L (0.6%) at different rates (1 g/hr to 80 g/hr) depending on the model. One liter of the solution is enough to treat 4,000 L of drinking water. Supplies required: clear water, salt (400 g/L of water), and electricity (30 W or 110-220 V). WATTA includes 5 devices with different active chlorine production capacities. The design specification for individual WATTA products can be found here.
Consumables can be purchased online from Antenna Technologies.
This product has a 2-year warranty and a lifecycle of approximately 5 years assuming 5 productions a week.
Designer specified performance targets include: lightweight, durable, portable, locally produced, and low-cost. Moreover, this filter was also designed to prepare active chlorine solution that can be used to treat drinking water or disinfect any objects or surfaces.
Antenna views the continued support from customers as evidence of vetted performance.Correspondence with manufacturer
WATA devices have been sold for almost 10 years to large organizations such as WHO, ICRC, UNICEF, Swiss Agency for Development and Cooperation, MSF, OXFAM, HELVETAS, CARITAS, and others.
No official testing has been completed. The manufacturer uses positive feedback from customers as evidence of positive field results.Correspondence with manufacturer
Limestone deposits are formed during production which needs to be cleaned with 1:1 clean water and vinegar solution to ensure efficiency.
Ideally, the power supply is to be placed in a room adjacent to the production room. If this is not possible, place it as far as possible from the container where the chlorine is produced, in order to avoid contact with chlorine vapor which is highly corrosive.
The power supply should not be placed on the floor level and the devices need to always be immersed in the saltwater solution before being plugged into the power supply. The devices need to be rinsed with clear water after each production.
D von der Weid, 2015, Infection prevention and patient safety improvement in developing countries thanks to sodium hypochlorite production devices; Antimicrobial Resistance and Infection Control.
Reyna Robles and Carole De Bazignan, 2014, The Watasol Approach for a Sustainable Access To Safe Water; GRF Davos Planet@Risk: Special Issue on One Health (Part II/II).Vol 2, No 4.
WATA technology complies with recommendations of CDC and WHO (2004) for the disinfection in health centers.
The product has been field-tested for more than 10 years.
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