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The Circle filters are separated into two replacement filter cycles: the three-filter pack (RF-20) needs to be changed every six months while the RO Membrane filter (RF-40) only needs to be changed every 2 years.
Stage 3: RO MEMBRANE FILTER (RF-40): The RO Membrane filter works by pushing water through a semi-permeable membrane thereby separating H2O molecules from contaminants in the tap water. The powerful RO Membrane filter significantly reduces pollutants such as: heavy metals, cysts, fluoride, arsenic, industrial chemicals and more. Recommended replacement every 24 months.