This section provides a sampling of some of the major types of treatment technologies that may be implemented in a sanitation system. As with the component technologies of the functional elements of sanitation, there are a myriad of ways in which treatments can be configured. The exact configuration is dependent on the environmental variables, what can be supported sustainably and safely and the regional infrastructure and resources that are available. Additionally, a given treatment system may have delimiters that are determined by the source (i.e., stormwater, wastewater, or even waterless), user interface, supportable conveyance, whether it is intended for individual, cluster, satellite, or centralized systems as well as other factors. The design can be simple or complex, feasible in a rural environment or only urban environment, low technology or high technology, or it may incorporate resource recovery.