How often should oxygen tubing be changed?

Related questions

1. How much does it cost to rent a portable oxygen concentrator?
2. How many hours do portable oxygen concentrators last?
3. How much does Inogen oxygen cost?
4. Do oxygen concentrators use a lot of electricity?
5. Can you sleep with a portable oxygen concentrator?
6. Do you need a prescription to buy a portable oxygen concentrator?
7. Is it safe to pump gas while on oxygen?
8. Do oxygen concentrators run out of oxygen?
9. Can Oxygen concentrators be harmful?
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Tags

1. #cannula
2. #basis
3. #least
4. #monthly
5. #concentrator
6. #hours
7. #every
8. #change
9. #months
10. #recommended
11. #tubing
12. #using