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Replacement filters for the H2O 4 CPAP Ion Distilled Water System. These filters allow you to create an endless supply of distilled water. Filters should be changed every 3 months to ensure tap water is properly filtered. Each filter cartridge will remove harmful toxins from tap water for up to 60 nights and makes 6 gallons of ion-distilled water for CPAP machines. Not intended for drinking.
How to change your filter: