Reverse Osmosis has long been a standard in water purification. The process purifies water by pressurizing unfiltered water, and forcing its molecules through a semi-permeable membrane. The membrane allows the water molecules to pass, while trapping metals, contaminants and other particles, leaving you and your family with pure, delicious drinking water. RO Membranes usually last for up to 2 years and may last even longer depending upon the water quality and the maintenance of your RO system, including changing both sediment and carbon filters on a preventative maintenance schedule. Filter Pure stocks replacement filters and membranes for most Hydrotech Systems. Don’t know what membrane you need for your system, call our customer service team at 800-942-7873.