Different levels and types of services and the human rights to water and sanitation 2015, para. 49
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Moreover, a flush toilet with a sewered connection requires considerably more water than other forms of sanitation, which can raise environmental and affordability concerns. Piped sewerage has also faced criticism from an ecological perspective, questioning whether it is the soundest solution to flush away excreta with large amounts of freshwater that become contaminated in the process.
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Non-negotiated soft law
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Special Rapporteur on the human rights to safe drinking water and sanitation