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It is how efficiently an RO water purifier uses water, expressed as a percentage. Under the test conditions in the standard, within the unit's rated total purified-water capacity, it is the ratio of the total purified water produced to the total source water consumed. The higher the water efficiency, the better the unit utilizes water.\u003C\u002Fp>\n\u003Cp>Because of cross-flow filtration, RO purifiers necessarily discharge concentrate (reject water). Before the standard was published, the industry usually described utilization with a \"wastewater ratio.\" So how does \"water efficiency\" differ from that familiar \"wastewater ratio\"?\u003C\u002Fp>\n\u003Ch3>1. Different test conditions and rigor\u003C\u002Fh3>\n\u003Cp>The \"wastewater ratio\" was self-declared by manufacturers, often without strict testing—only an approximate figure. \"Water efficiency\" may only be claimed after testing under the conditions specified in the Water Efficiency Standard.\u003C\u002Fp>\n\u003Ch3>2. Different labeling requirements\u003C\u002Fh3>\n\u003Cp>The \"wastewater ratio\" was optional; there was no national mandate to display it. After the standard took effect, every RO water purifier must carry a water-efficiency label in a conspicuous place.\u003C\u002Fp>\n\u003Ch3>3. Different forms of expression\u003C\u002Fh3>\n\u003Cp>The \"wastewater ratio\" is a ratio—for example, producing one part purified water and discharging three parts concentrate is shown as 1:3. Water efficiency is a percentage—for example, 60% means 60% of the source water becomes purified water and 40% is discharged as concentrate.\u003C\u002Fp>\n\u003Ch3>4. Different meanings\u003C\u002Fh3>\n\u003Cp>Water efficiency measures resource utilization: purified water obtained versus total water consumed, \u003Cstrong>including\u003C\u002Fstrong> water used for flushing\u002Frinsing the unit.\u003C\u002Fp>\n\u003Cp>The \"wastewater ratio\" only compares purified-water flow to concentrate flow during RO membrane production; flush water is ignored no matter how much is used. It therefore does not reflect true water-resource efficiency—only an operating parameter of the RO unit.\u003C\u002Fp>\n\u003Cp>As living standards rise, people care more about drinking-water quality, and demand for purifiers keeps growing. RO units are especially popular for their high product-water quality. 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