Further definition of the ODEX may be read here: From detailed energy efficiency indicators to an aggregated energy efficiency index called ODEX (http://www.monitoringstelle.at/fileadmin/docs/de/Diverse_Dokumente/Definition_Odex.pdf)
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By having aerators and water flow restrictors fitted on your taps, the flow of water will feel stronger, but will consist of less water and more air. Aerated taps can reduce the water flow by 30-40 %.
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