A home oxygen concentrator is one of the few appliances in a house that runs for most of the day, every day, for years. Almost everything that goes wrong with one is traceable to a restricted airflow path — a clogged filter, a kinked line, a bottle filled past the mark. None of it is difficult to prevent, but it does need to be routine rather than occasional.
Below is a general maintenance framework. Your machine's own manual overrides everything here: intervals and cleaning methods vary between manufacturers, and if your unit is rented or supplied through a home care provider, some tasks are theirs to perform and not yours. Never open the cabinet of a concentrator or attempt an internal repair — there are pressurised components and mains voltage inside.
Know which filters you have
Most concentrators have more than one filter, and they are not treated the same way. Confusing them is the most common maintenance mistake.
- The gross particle / cabinet filter. Usually a foam or mesh pad in an accessible slot or grille on the outside of the machine. This is the one you clean, and it is the one that matters most for day-to-day performance. Typical guidance is weekly, more often in a dusty home or one with pets or a smoker in the household.
- The outlet or bacteria filter. Sits in the oxygen path before the tubing connector. This is normally replaced, not washed, on a schedule set by the manufacturer.
- Internal filters and the sieve beds. These are service items. They are replaced by a qualified technician at defined intervals or running hours, and are not user-accessible.
Cleaning the cabinet filter
The usual method, subject to your manual: switch the machine off and unplug it, remove the filter, rinse it in warm water with a little mild detergent, rinse clean, and then — the important part — let it dry completely before refitting. A damp filter restricts airflow and can encourage mould growth. Keeping a second filter on hand means you can swap in a dry one and never run the machine without one, which lets dust straight into the compressor.
Tubing, cannulas and connectors
These are the cheapest parts of the system and the most neglected.
- Nasal cannulas are single-patient disposable items. Typical replacement guidance is every two weeks with normal use, and sooner after any respiratory infection, or if the prongs become stiff, discoloured or uncomfortable.
- Supply tubing is generally replaced every one to three months. Replace it immediately if you find cracks, permanent kinks, stiffness, or any discolouration or smell inside the line.
- Check the whole run for kinks daily. Long tubing is convenient and also gets trapped under chair legs, wheels and doors. A pinched line reduces delivery without necessarily setting off an alarm.
- Wipe the exterior of tubing with a damp cloth as needed. Do not attempt to wash out the inside of supply tubing — water left in the line is a contamination risk and cannot be reliably dried.
- Check connectors seat firmly. A loose fitting at the outlet is a slow leak you will not hear.
Humidifier bottles
A humidifier bottle is fitted only if your prescriber has specified one — typically for higher flow rates or where nasal dryness is a problem. It is a bottle of water that the oxygen bubbles through, which makes it the single most infection-prone part of the setup.
- Use only distilled water, or whatever your provider specifies. Tap water leaves mineral deposits that block the diffuser; it is also not sterile.
- Empty, rinse and refill daily. Do not top up a partially full bottle — discard the remaining water first.
- Fill only between the marked minimum and maximum lines. Overfilling can push water into the tubing.
- Wash the bottle thoroughly on the schedule in your manual — commonly weekly — and let it air dry fully before reassembly.
- Keep the bottle upright and below the level of the cannula, so that any water that does escape runs back rather than forward.
- Replace the bottle itself at the interval your supplier specifies. They do not last indefinitely.
The machine itself, and where it sits
- Leave clear space around the cabinet — manufacturers typically specify a minimum clearance on all sides, often around 12 inches. A concentrator pushed against a wall or into an alcove starves itself of intake air and runs hot.
- Never place it on carpet pile that can block underside vents, or behind curtains.
- Wipe the exterior weekly with a damp cloth. Do not use alcohol, solvents or any petroleum-based product on or near an oxygen device.
- Keep it away from heat sources and out of direct sun.
- Do not use an extension lead or a multi-way adaptor unless the manufacturer explicitly permits it; plug the unit directly into a wall socket.
Keep a simple log
Two things are worth writing down: the hour meter reading each month, and the date of every filter clean, tubing change and cannula change. The hour meter is what determines service intervals and warranty position, and a maintenance record is the first thing a technician will ask for. A note on the calendar is enough.
When to stop and call your supplier
Contact your equipment provider promptly if any of the following occur. Do not attempt to diagnose these yourself.
- Any alarm that does not clear — particularly a low oxygen purity alarm, a low pressure alarm or a power-failure alarm
- A change in the machine's normal sound: new rattling, grinding, whistling, or a cycling rhythm that has altered
- The cabinet running hotter than usual, or any smell of burning or hot plastic
- Visible damage to the mains lead, plug or cabinet
- Water in the tubing that persists after the humidifier bottle has been correctly emptied and refitted
- The unit shutting itself down, or failing to restart
And contact your healthcare provider, not your equipment supplier, if you feel more breathless than usual, notice confusion, a persistent headache, or a bluish tinge to the lips or fingertips — whatever the machine appears to be doing. Symptoms are a clinical matter.
Always have a backup
Every maintenance plan needs a contingency. Agree with your supplier what your backup oxygen source is — usually a compressed cylinder — keep it accessible and in date, and know how long it lasts at your prescribed setting. Register with your electricity provider as a customer with medical equipment in the home so that you are prioritised during outages.
Stationary units such as the TruAire 5 Oxygen Concentrator by Roscoe Medical, a mains-powered continuous-flow unit rated for 0.5–5 LPM, follow the same general maintenance pattern described here — but always work from the manual supplied with your specific device.
Related reading
- How an oxygen concentrator actually works, and stationary vs. portable trade-offs
- Getting started with home oxygen therapy: prescription, setup and caregiver support
- Using oxygen safely at home: fire risk, tubing and cannula comfort
- Oxygen away from home: batteries, air travel, altitude and power cuts
Browse oxygen management and respiratory care and oxygen management.
Supplemental oxygen is a prescription medical treatment. This article is general information only and does not replace the manual for your device or the instructions of your prescriber and equipment supplier. Do not change a prescribed flow setting.
