This paper reports a study of the LifeStraw™ in El-Masraf camp within Gezira State, Sudan. A total of 647 eligible subjects participated in the study. Two week incidence of diarrhoeal rates were estimated by a community survey some four months before and again four months after provision of the LifeStraw™. In addition counts were kept of people attending at the community clinic with diarrhoea. Compliance rates were good with 86.5% of people saying they always used it and only 3.7% saying they had never used it. In a before implementation survey 15.3% of participants reported diarrhoea in the previous 2 weeks compared with only 2.3% in a survey after implementation. Similarly 58 people presented to the clinic as a new case of diarrhoea in the four months before compared with only six in the four months after implementation. When compared with diarrhoeal attendances at the regional hospital, this was a statistically significant decline in attendances (p<0.0001). The LifeStraw™ is likely to find a role as an adjunct to water quality interventions aimed at the home. However, more research is needed to assess the long-term impact and uptake of these devices before their definitive value can be assessed.