This is the Replacement Cartridge Filter for the Zoey CPAP Cleaner. Get this Replacement Filter only if your filter has been lost or damaged before the normal 120 use interval.
Use the Zoey Filter and Check Valve Kit to routinely replace the check valve every 120 uses when you replace the filter.
The filter is necessary to keep activated oxygen from entering your household air.
Though Zoey will remind you, we recommend purchasing the replacement filter in advance of the replacement date!