Multipure AquaRO Replacement Membrane (CB-ROM)
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As Multipure prefers to take care of replacement filters you can use this link to purchase them directly from them. AquaRO Replacement Membrane
Stage 4: The RO Membrane is a high-production, 50 gpd, thin film composite semipermeable membrane that separates unwanted inorganic impurities, such as nitrates, fluoride, etc. from your water. This hyperfiltration membrane reduces salts, certain heavy metals, and other impurities, giving you great tasting water. Recommended membrane change (Model No. CB-ROM): approximately every 2 years.