Watts Flowmatic Compatible 50 GPD TFC RO Membrane W-1812-50 by Osmosis (RO) membranes are made from 100% food-grade Thin Film Composite (TFC) material for ultimate purification performance with high permeate flow, tested by an third-party to meet NSF/ANSI 58 standards, providing safe-clean drinking water. 50 GPD RO membrane with a high 97% stabilized salt rejection rate. Hundreds of impurities are reduced by over 99% through the 0.0001-micron TFC membrane layer, including heavy metals (fluoride, , magnesium, lead, colloids, , and nitrates), organic materials, and harmful minerals, including other soluble salts found in water resources. Industry-standard size 11.75 x 1.75-inch, designed to fit in standard 1812/2012 residential- RO membrane housings utilizing a 2-inch internal diameter. Suitable for most Reverse Osmosis Water Filtration System Reverse osmosis water filter replacement for standard membranes including but not limited to MEM-ES-50, Aquatic Life 330084, TF-1812-50, TW30-1812-50, Water FLTMEME50, FS TFC TFC-1812-50, FX12M, MC5, and TLC-50.