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A concealed membrane is a water purifier membrane that is designed to remove impurities from water without the need to open the membrane housing. Concealed membranes can help to:Remove heavy metals, bacteria, viruses, and other contaminantsReduce chlorine and fluorideEliminate pesticides and leadRemove nitrates Concealed membranes can be used with most brands of RO purifiers and are compatible with all types of RO systems. Some concealed membranes are made with anti-bacterial sheets and food grade plastic housings. Here are some examples of concealed membranes:R & G Water Purifier MembraneThis membrane is made of plastic and can remove up to 97% of total dissolved solids (TDS). It also has a flow rate of 18 liters per hour. Captain Pure Concealed MembraneThis membrane can remove impurities, reduce chlorine, eliminate fluoride, reduce pesticides, remove lead, and remove nitrates. BIOTIC WATER Nano Magna Type Welded RO Membrane FilterThis concealed membrane is suitable for Aquaguard Nano and Magna models and almost all brands of RO purifier. It is 100% leak proof. Meetec Concealed MembraneThis thin film composite (TFC) membrane is made of polysulfone and has a pressure of 70 psi (4.8 bar). Concealed MembraneThis membrane has an innovative concealed design that maintains the integrity of your water system while removing contaminants.