Desert Rose has patented a biosand filter design in which the shell of the filter is fabricated from sheet steel joined with a waterproof seal and set in a stable base of concrete. The Sheet Shell Sand Filter can be made faster (3/day/person with hand tools) with cheaper tools (at a cost of approximately 200 USD), and it weighs no more than an average suitcase (23Kg) and removes significantly more pathogens than a cement biosand filter.
In addition, lower transportation costs and faster manufacturing rates are possible with the Sheet Shell Sand Filter. The cost-effective design enables far more people to access drinking water with the same funding than similar implementation of CBSFs. Desert Rose trains artisans working for NGOs on how to make the filter. The filter also incorporates a number of design “tricks” that enable higher pathogen removal performance.
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Partners: Oxfam Intermon, Tearfund/Water is Life International, Global Team Local Initiatives (GTLI).