Dow FilmTec TW30-1812-100HR – 100 GPD High-Rejection RO Membrane for Undersink

Overview

The Dow FilmTec TW30-1812-100HR is a 1.75-inch by 11.74-inch reverse osmosis membrane designed for undersink systems in homes. Built with a polyamide thin‑film composite (TFC) layer, this element is engineered to deliver consistent filtration performance while fitting standard residential equipment.

Rated at 100 GPD under typical operating conditions, it supports reliable daily output for everyday drinking water needs. The element ships dry, which helps preserve shelf life and simplify storage until installation. It also carries NSF/ANSI Standard 58 certification, reflecting alignment with widely recognized performance and safety benchmarks.

The TW30-1812-100HR is sized to fit standard 2x12 pressure vessels, making it a practical upgrade for many undersink RO setups. This combination of size, certification, and a proven filtration design makes it a versatile choice for home filtration projects.

Performance and practical use

• High-rejection filtration via polyamide TFC for dependable water quality.
• Designed to operate around 50 psi, with a noted efficiency advantage over some 60 psi-rated elements under favorable conditions.
• Chlorine handling: tolerant to residual chlorine below 0.1 ppm, helping protect the membrane when pre-treatment is limited.

Note: If your water contains chlorine, a Carbon/Sediment Pre Filter is recommended to maximize membrane life and performance. Water chemistry and system configuration will influence actual results, so consider this membrane as a strong possibility for upgrading an existing undersink RO system.

Fit, durability, and value

• Compact 1.75" x 11.74" footprint that works within standard under-sink configurations.
• Free chlorine tolerance helps maintain membrane integrity under typical municipal water conditions.
• Shipped dry for long shelf life and straightforward handling prior to installation.

In residential settings, this FilmTec membrane is designed to provide reliable, repeatable filtration performance, with the potential for better water output and filtration efficiency when paired with compatible pre-filters and a well-matched RO system. While individual results vary, many users appreciate the balance of build quality, certification, and compatibility that the TW30-1812-100HR offers for home drinking water purification.