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Accepted as a rule, but not always covering all costs in sewered systems. Poor often cannot afford the fees. Also used for communal facilities that are managed by group of families, paying monthly rates, for example in Nairobi (http://wupafrica.org/toolkit/resources/caseExamples/narrative-form.html). In South Africa differential tariffs are used to support the poor, and no tariff is charged to families using less than 6000 litters of water per month (http://www.joburg.org.za/services/water3.stm). Potential relates to the need to sustain services
== References ==
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