No! There is no waste water in RO machine! It has only one inlet water (or “raw water”) and two outlet waters, namely “permeate water” (i.e. purified water, drinking water) and “concentrated water” (i.e. purified water, washing water).
RO machine is a good quality water supply system. Tap water is filtered by PP melt blown filter element, granular activated carbon adsorption filter, compressed activated carbon filter and other three pretreatments (removal of residual chlorine in the water, most of the suspended matter, rust, colloid, As well as some organic matter, smell and taste), a small part of the water is then subjected to reverse osmosis (removal of various impurities in the water, including bacteria and other microorganisms, to make “permeate water”) and post-positioned granular activated carbon adsorption filtration (further removal of organic matter , Smell and taste, improve the taste), to prepare pure drinking water for drinking; and most of the water (concentrated water) has gone through the first three stages and failed to undergo the second stage treatment, and becomes purified water and flows out as washing water. In the daily life of the family, the demand for water for washing happens to be much larger than drinking water, such as washing rice, washing vegetables, washing pots, dishes and tables, washing clothes, mopping the floor, flushing toilets…
Since RO machine concentrated water has undergone three treatments, in addition to the higher salt content than tap water, most of the other indicators, such as turbidity, color, residual chlorine, smell and taste, organic matter, suspended matter, colloid, COD (chemical Oxygen consumption), TOC (total organic carbon), SDI (pollution index), etc., are all much better than tap water!
Therefore, it is completely wrong to call RO concentrated water “waste water”!
In terms of per capita water consumption, my country is a water-poor country. It is necessary to save water and energy, reduce carbon emissions, and achieve zero emissions! It is completely wrong to insert the concentrated water pipe into the sewer and discharge a large amount of RO machine concentrated water in vain! The act of wasting water should be condemned!