Major technological and scientific challenges arise from the pressure to provide widely available and sustainable technologies for the societal requirements for health and a clean environment. The protein extract from seeds of a tropical tree, Moringa oleifera (MO), has attracted particular interest in water treatment because of its coagulant and antimicrobial properties. It is known to bind to a wide range of surfaces and to associate in solution. Interesting changes in zeta potential occur in the presence of anionic surfactants. This will be explored with SANS experiments that should elucidate aggregate structures and further help in optimising formulation of water treatment materials for different impurities. As a proxy for surfactants in ground water we will use SDS that is available with isotopic labels.