Deep Springs International (DSI)
Gadyen Dlo, distributed in Haiti, is a chlorine solution to disinfect water.
Gadyen Dlo, or “Water Guardian” in Haitian Creole, is a liquid chlorine product sold by the bottle to disinfect drinking water. This product is intended to remove/inactivate bacterial, viral, and some parasitic contamination from drinking water.
Goal 6: Clean water and sanitation
Rural households in Haiti.
Locally produced in Léogâne, Haiti via machine-automated processing.
User can directly contact the manufacturer. The product is sold in Léogâne, Haiti via a network of 150 health workers.
The distributer claims that about 2,000,000 people have been impacted.
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)
Included is one 8 ounce bottle with cap for dosing and instructions in Haitian Creole with illustrations. Other purchasing option is 1 gallon containers. Almost always, 5 gallon safe-water-storage buckets with spout are distributed for free.
See CDC training Manual (Module 7) for product schematic and training information
8 oz bottle treats 700 L of water
The product can treat an average family’s water for 6 weeks.
In conjunction with proper household treatment and storage, tests have shown 80% reduction in water-borne diseases.
Global Health Institute and Sustainability Initiatives at Emory University and by the Eugene Gangarosa Endowment at the Centers for Disease Control and Prevention (CDC) Foundation.
If one family is using a container that is not covered, it will need to treat the water every 24 hours. If the container is covered and has a tap, the family only needs to treat it one time.
Filtration method and safe water storage system
Harshfield et al., Evaluating the Long-Term Health Impact of Household Chlorination of Drinking Water in Rural Haiti, Proceedings of the Water Environment Federation, 2011, pp. 274-302(29)
Garnett, Erin. Gadyen Dlo “Water Guardian”: A Qualitative Study of the Influence of Cholera on Household Water Treatment Practices in Haiti, Thesis, Emory University (2013)
NSF / ANSI Standard 60: Drinking Water Treatment Chemicals: Gadyen Dlo is not specificially listed as complying, but dozens other companies selling sodium hypochlorite products for drinking water treatment are approved. This certifies that chemicals are safe at the maximum dose and that any impurities are below the maximum allowable limit.
US Environmental Protection Agency (EPA) Registration: Gadyen Dlo is not registered with the EPA but sodium hypochlorite has been since 1957, and the EPA issued a registration standard in 1986 saying that sodium hypochlorite products (with 5.25% – 12.5% chlorine) do not need individual registration review.
World Health Organization (WHO) Guidelines for Drinking Water Quality list liquid NaOCl with concentrations between 0.5% and 1% as a point-of-use water treatment method.
Lab and field evaluations
Gadyen Dlo report by Pepahaiti
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