What is Dispensers for Safe Water?
Dispensers for Safe Water is a seemingly simple solution to the problem of unsafe water in rural and remote communities.
We place chlorine dispensers in the immediate vicinity of wells and other water sources.
Community members go to their water source to fetch water, place their bucket or jerrican under the dispenser, turn the valve to dispense a correctly measured amount of diluted chlorine, and then fill the bucket with water.
The chlorine disinfects the water as a community member is walking home, and by the time he or she arrives, much of the chlorine smell has dissipated and they are left with clean, safe water that stays safe for 2-3 days.
Five Reasons Why Dispensers Work
1. salient and focused on behavior change
Dispensers are installed right next to the water source – they can’t be missed. The use of dispensers is also free. That is controversial in some circles that emphasize pay-for service water. However, we looked carefully at the evidence, and it shows that people are reluctant to pay for preventative healthcare products and services. This is especially true for the very poor. Additionally, in every community with a dispenser, there is an elected, local community promoter who is responsible for the dispenser and educates villages on how to use it.
2. sustained, last-mile service
Dispenser for Safe Water runs a very sophisticated maintenance and supply chain. In order to be most successful, chlorine dispensers require high rates of usage by people in a given village. We know, through our data collection, that there are a couple different components that contribute to higher usage rates:
- Dispensers have to be functional, so we have circuit riders who maintain and repair dispensers in even the most remote locations
- They have to be full, so our circuit riders deliver chlorine to our local promoters in regular intervals (usually every three months).
Dispensers for Safe Water are, according to a 2007 academic study, more cost-effective than other solutions like solar disinfection, flocculation, and ceramic filters.
In fact, we’re now doing a very detailed cost analysis to more thoroughly understand how dispensers compare to other water products.
Not only that, but the cost per person for chlorine dispensers decreases as we continue to scale, and reach more people.
4. Targeting HEALTH EQUITY
Safe water has become an equity issue. We’re reaching the people left behind by the current approaches to safe water: that cohort of people who are very rural and very poor in Sub-Saharan Africa.
We are ultimately targeting health impacts and are modeling the rates of averted diarrhea and averted DALYs with Dispensers for Safe Water.
DALY is an actuarial term that tries to calculate the number of years lost due to ill-health, disability or early death — it’s used as a way to compare the overall health and life expectancy in different countries, especially developing countries versus more developed countries.
We know that chlorine kills bacteria, and we know from various evidence that bacteria reduction reduces diarrhea. In fact, water systems the world over routinely chlorinate water — the water you brush your teeth with is chlorinated. We can measure self-reported diarrhea, and while we cannot measure actual diarrhea reductions because that is very complex and costly, our detailed models suggest that we avert more than 830,000 cases of diarrhea per year and more than 22,000 DALY’s at a very low cost per person/per year.
5. BASED ON EVIDENCE
Lastly but perhaps most importantly, Dispensers for Safe Water are a rigorously tested and proven solution. Our approach is based on a series of randomized controlled trials by Harvard and Berkeley researchers who tested chlorine dispensers in Kenya against a variety of other water treatment options. They found two things: 1) chlorine dispensers had a much higher usage rate than comparable treatments, and 2) use stayed high over time. We speak ore about the available evidence below.
Dispensers is a poster child for how Evidence Action works – we look for evidence of a solution that works, and then turn it into a scalable solution for millions of people.