The Watts Premier RO Water Filter 50 GPD Membrane Replacement is a high-quality, semi-permeable membrane designed for reverse osmosis systems. It effectively reduces TDS, sodium, and contaminants like arsenic, lead, and chromium, ensuring pure drinking water.

Users praise its easy installation and compatibility with specific Watts Premier systems (4SV/4-Stage, 5SV/5-Stage, and Zero Waste). The built-in check valve enhances performance, and the filter lasts 2-5 years depending on water conditions.

Many reviewers highlight its effectiveness in significantly lowering TDS levels—some reporting drops from 250 PPM to as low as 2 PPM. Its durability and consistent performance make it a trusted choice for long-term use.

While some note minor variations in output PPM compared to older models, the overall consensus is positive. The filter restores flow rate and water quality, especially in systems with limescale buildup or high contaminant levels.

For those using well water or dealing with fluoride or other chemicals, this membrane has proven reliable where others failed. Its OEM design ensures proper system function, making it a worthwhile investment for clean, safe water.