WATA technology enables the local production of sodium hypochlorite (chlorine) for water disinfection and treatment purposes.
WATA technology allows users to make their own chlorine from water, salt, and electricity. The system converts a measure of salt and water into sodium hypochlorite (bleach) by way of electrolysis. The Wata products are available in 5 sizes depending on the quantity of active chlorine made from 0.5 to 60 liters.
Current distribution regions include Burkina Faso, Cambodia, Comoros, DR Congo, Guinea, India, Mali, Nepal, Pakistan, Rwanda and Zambia.
150 – 5,000 USD depending on the size of the WATA product.
SDG 6: Clean water and sanitation
The manufacturing process is all based in 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
More than 4,000 as of 2017.
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)
Using electrolysis, WATA devices produce a sodium hypochlorite equivalent to 6 g/L (0.6%) of active chlorine. The WATA products produce the hypochlorite at different rates (1 g/hr to 80 g/hr) depending on the model. One liter of the solution is enough to treat 4000 L of drinking water. Supplies required: clear water, salt (400 g/L of water), and electricity (30 W or 110-220 V).
The WATA device kits consist of the WATA device, 1 power supply, 1 pair of alligator clips for use with a photovoltaic panel (min. 50 Wp not included), 1 2.5 L can, 1 reagent WataTest, 1 reagent WataBlue, 2 syringes (50 ml and 5 ml), and a manual. The reagent kit includes WataTest and WataBlue which measures active chlorine concentration and residual chlorine respectively.
Antenna Technologies provides technical support.
Consumables can be purchased online from Antenna Technologies.
5 years assuming 5 productions a week and warranty of 2 years.
WATA devices aim to a sodium hypochlorite equivalent to 6 g/L (0.6%) of active chlorine. Each model has a specified production rate. 1 L of the active chlorine can treat 4000 L of water.
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 the 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, Infection prevention and patient safety improvement in developing countries thanks to sodium hypochlorite production devices; Antimicrobial Resistance and Infection Control. 2015.
Reyna Robles and Carole De Bazignan, 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. 2014.
The 6 g/L active chlorine concentration complies with recommendations of CDC for the disinfection in health centers.
The product has been field tested for more than 10 years.
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