The dissolved solids like heavy metals (lead, iron, manganese, etc), mud, salts, and germs cannot are washed off with water that comes out as the reject water. There are so many filtration systems in the water purifier like pre-filter. Sediment filter, carbon filter and finally RO membrane.
https://www.allthepost.com/why-you-should-opt-for-best-ro-water-purifier-price-for-your-family/
 

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