Water filter RO membrane OEM ODM Customized brand.

Function
The residential RO membrane is the final purification stage in a home drinking water system. It uses a thin-film composite (TFC) polyamide semi-permeable layer to allow water molecules to pass while rejecting dissolved salts, heavy metals (such as lead and arsenic), nitrate, fluoride, and residual organic matter. Under typical household operating conditions, actual total dissolved solids (TDS) rejection is commonly around 90–96% , with laboratory-rated rejection reaching up to 96–99% depending on the model. The membrane operates at low feed pressure and is protected upstream by a PP sediment filter and carbon block filter, which remove particles and chlorine that would otherwise damage the polyamide layer. The purified permeate flows to a small pressurized storage tank or directly to the faucet, while the concentrated reject water is sent to drain. Residential RO membranes are designed for intermittent household use, not continuous industrial production, and are typically replaced every 12–24 months depending on feed water quality and prefilter maintenance.