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Es la eficacia con la que un purificador de OI utiliza el agua, expresada en porcentaje. Según las condiciones de ensayo de la norma, dentro de la capacidad total de agua purificada declarada, es la relación entre el agua purificada total obtenida y el agua de origen total consumida. Cuanto mayor sea la eficiencia hídrica, mejor aprovecha el equipo el agua.\u003C\u002Fp>\n\u003Cp>Por el filtrado de flujo cruzado, los purificadores de OI necesariamente descargan concentrado. Antes de la norma, el sector solía hablar de una «relación de aguas residuales». ¿En qué se diferencia entonces la «eficiencia hídrica» de esa «relación de aguas residuales»?\u003C\u002Fp>\n\u003Ch3>1. Condiciones de ensayo y rigor distintos\u003C\u002Fh3>\n\u003Cp>La «relación de aguas residuales» la declaraba cada fabricante, a menudo sin ensayos estrictos: solo una proporción aproximada. La «eficiencia hídrica» solo puede reclamarse tras ensayos según las condiciones de la Norma de Eficiencia Hídrica.\u003C\u002Fp>\n\u003Ch3>2. Requisitos de marcado distintos\u003C\u002Fh3>\n\u003Cp>La «relación de aguas residuales» era opcional; no había obligación nacional de marcarla. Tras la norma, cada purificador de OI debe llevar la etiqueta de eficiencia hídrica en un lugar visible.\u003C\u002Fp>\n\u003Ch3>3. Formas de expresión distintas\u003C\u002Fh3>\n\u003Cp>La «relación de aguas residuales» es una proporción—por ejemplo, una parte de agua purificada y tres de concentrado se indica como 1:3. La eficiencia hídrica es un porcentaje—por ejemplo, el 60 % significa que el 60 % del agua de origen se convierte en agua purificada y el 40 % se descarga como concentrado.\u003C\u002Fp>\n\u003Ch3>4. 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