Got lucky today and found out that the stationary concentrator my insurance was renting for me was on a rent to own contract. They told me it's mine now. I have had it for exactly one year now and just kept up what they asked me to on it. Vacuum out the back once a month and wipe it down with mild soap and warm water. Do any of you out there know what might else needs to be done to keep it up and running for years to come? Do they have those things in them that the POC's have. Forget what they are called but they need to be replaced about every 500 hours, I think. Not sure on that either. Boy oh boy, am I getting lazy, need to brush up on this stuff. Who would have ever thought that back when you were smoking cigarettes and drinking beer that you would someday have to study up on things like this. Oxygen concentrator filters, give me a break. Remember back in the military: light-m-if-u-got-em............should a quit right there.