text: The omni processor is targeted as a solution for developing countries, although challenges around technical and financial aspects remain. Omni processors and omni ingestors are being designed to provide an alternative to sewerage system-based technologies. They are also intended to address the large number of existing pit latrines which lack a supporting infrastructure of fecal sludge collection and processing when the pits are full. Sludge from pit latrines has to be removed from the pits for treatment and disposal either by pumping (if the fecal sludge is sufficiently liquid) or by manual emptying with shovels or other devices (in India, this practice is called manual scavenging). Despite new low-cost pumps being developed, only a small fraction of sludge is safely extracted and treated currently in many African and Asian cities.