A reverse osmosis (RO) membrane is a semi-permeable barrier used in water purification to remove dissolved salts, chemicals, and other impurities by applying pressure. It typically consists of a thin polyamide layer on a polysulfone support layer, which is itself on a polyester fabric. This structure, often configured in a spiral-wound or hollow-fiber format, allows water molecules to pass through while blocking larger contaminant molecules under pressure.
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