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Hand-pumps are appropriate for areas that are either not served by vacuum trucks, where vacuumtruck emptying is too costly, or where narrow streets and poor roads may limit the ability of a vacuum truck to access the site. The hand-pump is a significant improvement over the bucket method and could prove to be a sustainable business opportunity in some regions. The MAPET is also well suited to dense, urban and informal settlements, although in both cases, the distance to a suitable sludge discharge point is a limiting factor. These technologies are more feasible when there is a [[Transfer Station - Underground Holding Tank]] or [[Sewer Discharge Station]] nearby.