The mixture rule states that any mixture of a listed hazardous waste and a non-hazardous waste remains regulated as a hazardous waste. Mixtures of characteristic wastes and non-hazardous waste are regulated as hazardous waste if the resultant mixture continues to exhibit the characteristic.
1 Wash the cannula in soapy water and rinse it with a solution of 10 parts water and one part vinegar. 2  Rinse thoroughly with hot water and hang to dry.  This connects the nasal cannula to the oxygen concentrator. It doesnât need to be cleaned, but plan to replace it every 6 to 12 months advises the ATS.
That being said, I bought the Vornado AQS because it said I would only have to change the filters 1-2 times a year, unless the filters had visible build up. I leave my purifer on all day, every day, on the quiet setting in my small bedroom. My door is always closed and I have a separate filter on the air duct.