The type dimension of the Reverse Osmosis (RO) Membrane market is principally divided into thin‑film composite (TFC), cellulose acetate, and polyamide membranes. TFC membranes dominate the market, accounting for roughly 65% of total sales, due to their superior salt rejection rates (up to 99%) and durability under high pressure, which makes them the preferred choice for large‑scale desalination and municipal water treatment projects. Cellulose acetate membranes, representing about 20% of the market, are valued for their lower cost and chemical resistance, catering to niche applications such as low‑pressure residential systems and certain industrial pretreatment processes. Polyamide membranes, comprising the remaining 15%, offer a balance of permeability and fouling resistance, finding use in food‑processing and pharmaceutical sectors where product purity is critical. Collectively, these sub‑types shape the overall market size by aligning product performance with cost and regulatory demands, illustrating the nuanced nature of Reverse Osmosis (RO) Membrane segmentation across diverse end‑users.