Tackling the Gigantic Goliath of Bad Water

Water Crisis

Water is the most abundant resource on the planet, yet less than 1% of the Earth’s freshwater supply is readily available to drink. Lack of accessible clean drinking water cripples communities in many developing countries.

One billion people are living without safe drinking water.

Two million killed annually from waterborne disease, mostly children.

Over half of the world’s hospital beds are filled with people suffering from waterborne disease.


Named after the tool the Biblical David used to deal with Goliath. DEKA set out to tackle the problem of bringing clean water to the world. The Slingshot helps to provide access to clean drinking water resources in areas of the world where access is extremely limited.

How it works

We use vapor compression distillation to purify water.

1. Heat Exchanger

The cold source water is heated as it flows past the warm clean water.

source water   Cold Source Water
warm clean water   Warm Clean Water

2. Evaporator

The preheated source water enters the evaporator from the bottom. It’s heated as it rises through the copper tubes. Plastic dowels are placed inside the tubes to restrict flow, creating a thin film of water between the dowel and exposed tube. The copper tube acts as a condenser for the clean steam, aiding in evaporation.

3. Compressor

The compressor raises the pressure from 7 to 9 psi. This also increases the temperature of the steam. The difference in temperature allows the steam to condense on the “cooler” evaporator tubes.

4. Condenser

The hot steam condenses on the “cooler” tubes producing pure clean water. The condensing steam provides the energy needed for evaporation.

Repeat steps 1~4

DEKA’s engineers and designers played an integral role in developing a highly efficient device which allows for the production of pure, clean water while using low levels of electricity, that is simple to operate and requires little ongoing maintenance.

Coca-Cola and DEKA piloted the Slingshot technology at schools in Ghana in 2011-2012 and installed units at schools in Pilar, Paraguay and health clinics in the Eastern Cape of South Africa in 2013-2014.