Aquatic scientists often need to store natural samples for a period of time before processing them using FlowCam. There are multiple preservatives available for this purpose. Glutaraldehyde is a
popular choice of preservative because it will preserve pigment autofluorescence, and therefore allows the use of FlowCam's "Trigger Mode" to automatically distinguish cyanobacteria from other algae, and reduce images of detritus and other non fluorescing particles. Another preservative often used is Lugol's solution, which does not preserve fluorescence, but is less toxic and requires less stringent storage conditions.