The FilmTec TW30-1812-50 is a tap water (TW) thin-film composite (TFC) reverse osmosis membrane manufactured by DuPont/Dow FilmTec. It has a production capacity of 50 gallons per day (GPD) at 60 psi feed pressure, 77°F (25°C), and 250 ppm softened tap water. The membrane measures 1.8 inches in diameter by 12 inches in length, fitting standard 1812-sized RO housings. It achieves a nominal rejection rate of 96–98% for total dissolved solids (TDS) and filters down to approximately 0.0001 microns, removing dissolved salts, heavy metals, and most contaminants at a molecular level.

The FilmTec TW30-1812-50 membrane typically lasts 2 to 3 years under normal residential use, depending on feed water quality, incoming TDS levels, and proper pre-filtration. To maximize the life of the TW30-1812-50, ensure your sediment and carbon pre-filters are replaced every 6–12 months to protect the membrane from chlorine damage and sediment fouling. A noticeable drop in water production or rising TDS readings are clear indicators that the TW30-1812-50 needs replacing.

The FilmTec TW30-1812-50 fits virtually any standard under-sink residential RO system that uses a 1.8" x 12" membrane housing with a 50 GPD output. This includes popular systems from brands that specify a 1812-50 or TW30-1812-50 compatible membrane. Its standard O-ring sealed design and industry-standard dimensions make it a direct drop-in replacement for most 4-stage and 5-stage reverse osmosis drinking water systems.

The FilmTec TW30-1812-50 uses cross-flow reverse osmosis technology to reject up to 98% of total dissolved solids, including lead, arsenic, fluoride, nitrates, sodium, chromium, copper, barium, radium, cadmium, cysts, and many other dissolved inorganic contaminants. Because the TW30-1812-50 filters at approximately 0.0001 microns, it also removes particulates and microorganisms far smaller than what conventional carbon or sediment filters can capture, delivering bottled-water-quality drinking water directly from your tap.

Yes. The thin-film composite (TFC) material used in the FilmTec TW30-1812-50 is highly sensitive to chlorine, which can permanently damage the membrane and reduce its rejection performance. A carbon pre-filter must always be installed upstream of the TW30-1812-50 to remove free chlorine from the feed water. Maintaining feed pressure between 40–85 psi, feed water temperature between 40–100°F, and a pH range of 2–11 will ensure the TW30-1812-50 delivers optimal performance throughout its service life.