CPAP Replacement Schedule: What to Replace, and Exactly When
CPAP Replacement Schedule: What to Replace, and Exactly When
Your machine never tells you a part has worn out. It just leaks a little more each week while the usage hours on screen still look perfect. Here's the full schedule — and the signs you're already overdue.
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Worn CPAP parts don't fail. They fade.
Almost nobody gives up on CPAP because their machine broke. They drift away from it because therapy slowly stopped feeling worth the hassle — and a surprising amount of the time, the real culprit is a mask cushion that should have been replaced three months ago.
That's what makes worn consumables so frustrating. They don't announce themselves. Last month the seal was perfect. This month it's fine. Next month you're tightening the headgear a notch. By the time you notice a dry mouth, a red line across the bridge of your nose, and a nagging sense that CPAP isn't working like it used to, the part responsible has been quietly underperforming for weeks.
The reason is simple arithmetic. Your setup runs roughly 2,500 hours a year — the equivalent of a full-time job — in warm, humid, continuously moving air, pressed against skin. Very few household items get that kind of use, and the parts that touch your face take the worst of it.
What a worn part actually costs you
Leaks are the mechanism. When a cushion stops sealing cleanly, air escapes around the edges, and your machine compensates by working harder to maintain the pressure you were prescribed. The display still shows your usage hours, your therapy still looks like it happened, but the pressure actually reaching your airway is lower than it should be.
That's why people report the same cluster of symptoms when their consumables are overdue: daytime tiredness creeping back, a dry mouth in the mornings, red marks from over-tightening, and the growing suspicion that CPAP "isn't working for me any more". In most of those cases, nothing is wrong with the therapy or the machine. The consumables have simply reached the end of their working life.
How often should you replace each CPAP part?
These are the intervals manufacturers such as ResMed generally recommend for daily use. Treat them as your baseline and shorten them if you have oily skin, hay fever, pets in the bedroom, or live in a hard-water area.
| Part | Replace every | Why it wears out |
|---|---|---|
| Mask cushion / nasal pillows | 1 month | Silicone absorbs facial oils, hardens and stops sealing cleanly |
| Memory foam cushion (AirTouch) | 1 month | Foam compresses and can't be washed, so it wears faster |
| Disposable air filter | 1 month | Fills with dust and allergens until airflow is restricted |
| Reusable / hypoallergenic filter | 6 months | Washable, but fibres break down with repeated cleaning |
| Standard or SlimLine tubing | 3 months | Micro-tears and internal residue develop invisibly |
| Heated tubing (ClimateLineAir) | 6–12 months | Heating element and connector outlast a standard hose |
| Mask frame | 6 months | Plastic fatigues, clips loosen, cushion starts shifting |
| Headgear and chin straps | 6 months | Elastic stretches, so you over-tighten to compensate |
| Humidifier water chamber | 6–12 months | Mineral scale builds up and the seal clouds or distorts |
| CPAP machine | About 5 years | Motor hours accumulate; pressure accuracy can drift |
If you only remember two lines from this table, make them the cushion and the filter. Those are the monthly items, they're the cheapest things in your setup, and between them they account for the overwhelming majority of comfort complaints.
Silicone and memory foam wear out differently.
If you've switched between an AirFit and an AirTouch mask, the care routine changes completely — and getting it wrong destroys a foam cushion in a single wash.
The trade-off is straightforward. Memory foam is gentler on sensitive skin and is often the answer for people who get red marks or pressure sores from silicone, but it's a true consumable with a shorter and less forgiving life. Silicone is more durable and fully washable, but it hardens as it absorbs oils, and that hardening is the single most common cause of new leaks on a mask that used to fit perfectly.
Neither is better. They just need different habits, and the mistake we see most often is someone moving from an AirFit to an AirTouch and carrying their old washing routine across with them.
What each part does, and how it tells you it's finished.
The cushion does the hardest job in your whole setup. It sits against skin for seven hours a night, absorbing facial oils, sweat and any moisturiser you wear to bed. Silicone gradually loses the slight tackiness that lets it seal against your face without pressure — and once that's gone, the only way to get a seal is to tighten the straps, which is exactly what causes red marks and sore spots.
It's time when: leaks appear that weren't there last month, the cushion feels firm or looks shiny, you're tightening the headgear to compensate, or air starts blowing into your eyes at night.
Your filter traps the dust, pollen and pet dander in your bedroom air, and it does that well right up until it's full. After that, your motor has to pull harder through a clogged barrier, which makes the machine louder and shortens its working life. It's the cheapest part in the system and comfortably the most neglected.
It's time when: the filter looks grey or brown, there's visible dust in the housing, or the machine sounds louder than you remember. If you have pets or hay fever, check fortnightly rather than monthly.
Hoses flex thousands of times and get washed repeatedly, and they develop micro-tears you simply cannot see. Air escapes along the length of the tube, your machine compensates without telling you, and nothing on the display indicates a problem. This is the part people most often keep far too long, purely because it still looks fine.
It's time when: there are visible cracks or splits, the interior looks cloudy, residue won't rinse away, or either connection feels loose. Heated tubing lasts longer, but check the electrical connector for corrosion or damage each time you clean it.
Headgear doesn't snap. It relaxes by about a millimetre a week, and you compensate automatically without ever noticing. Six months later you're pulling the straps far tighter than you did when the mask was new, pressing the cushion into your face rather than resting it there. The frame ages alongside it — plastic fatigues and clips loosen, which lets the cushion shift position during the night.
It's time when: the straps are pulled much tighter than when new, the elastic looks limp or frayed, or you wake with marks and soreness. One tip that matters more than it sounds: when you fit new headgear, reset the tension from scratch rather than matching the old setting, or you'll be over-tightened from night one.
Hard water leaves mineral scale that no amount of washing fully removes, and the seal gradually distorts, which can let water escape around the chamber rather than through the machine. Large parts of the UK have genuinely hard water, so this part often reaches the shorter end of its range rather than the longer one.
It's time when: you can see white or chalky deposits inside, the plastic has gone cloudy or discoloured, or water leaks around the seal. Using distilled water slows scale build-up considerably if you're in a hard-water area.
CPAP machines are robust, but the motor accumulates thousands of running hours and pressure delivery can gradually drift away from the setting you were prescribed. Five years of nightly use is the point at which most people should start thinking about it rather than waiting for a failure.
It's time to ask when: you hear new or louder motor noise, therapy feels different at unchanged settings, error messages appear, or the machine is simply approaching its fifth birthday. Discuss it with your clinician rather than making the call alone.
Stop tracking ten intervals. Track four.
Most people fall behind not because they don't know the schedule, but because the part isn't in the house when it's needed. Grouping the intervals solves both problems at once.
Habits that push parts to the top of their range.
Replacement intervals are a floor, not a ceiling. A handful of daily habits regularly get people to the longer end of each range rather than the shorter one — and most of them cost nothing.
Wash your face before bed
This is the single biggest factor in cushion life. Facial oils and night-time moisturiser are absorbed straight into the silicone, and a clean, dry, moisturiser-free face at bedtime noticeably slows that process. If you use skincare at night, apply it well before bed so it has absorbed fully.
Rinse the cushion daily, and choose your soap carefully
Warm water and a mild, unscented liquid soap, then air dry away from direct sunlight. Scented and moisturising soaps leave a residue that degrades silicone faster than the oils you're trying to remove, and alcohol wipes, bleach and antibacterial cleaners are worse still.
Never submerge memory foam
AirTouch cushions must only be wiped. Water destroys the foam structure, usually permanently and usually in a single wash.
Keep the heated tube's connector dry
Wash the hose thoroughly, but keep the electrical end well clear of water and let it dry completely before reconnecting.
Use distilled water where you can
Particularly in hard-water areas, distilled water dramatically slows the scale build-up that ends a water chamber's life early.
Store it out of sunlight
UV degrades silicone and plastic steadily. A bedside drawer or the travel bag is far better than a sunny windowsill, and it keeps dust off the mask between uses.
Six things people get wrong about replacing parts.
Tick more than two and something needs replacing.
The good news is that this is one of the easiest problems in CPAP to fix. A new cushion and filter resolve most of these within a single night.
NHS supplies, or buying your own?
If you were set up through an NHS sleep clinic, your consumables are usually supplied by that clinic. What's covered and how often varies considerably between trusts, though, and many patients find the replacement frequency they're offered is longer than the manufacturer's recommended schedule.
That's the gap most people fill privately. Buying your own cushions and filters between clinic appointments keeps you on the manufacturer's intervals rather than your trust's budget cycle, and it's also how most people try a different mask style without waiting for a review appointment.
A few things worth knowing before you buy:
Check with your sleep service first. You may be entitled to more than you're currently receiving, and it costs nothing to ask.
Your prescribed pressure settings stay with your clinician. Buying your own consumables doesn't change that, and you should never adjust prescribed pressure yourself.
VAT relief may apply. CPAP equipment can qualify for VAT relief for people with a chronic medical condition — worth checking at the point of purchase.
Keep your mask model written down. Cushions are model and size specific, and "the ResMed one" covers a great many different parts. Note the model and size from the frame or the original packaging before ordering.
Everything in the schedule, in one place.
Stocking up three months at a time is the simplest way to stay on schedule — the part being in the drawer is what actually makes the swap happen.
Quick answers on CPAP replacement.
How often should I replace my CPAP mask cushion?
How often should I replace my CPAP filter?
Do I need to replace my CPAP tubing if it looks fine?
How long does a CPAP machine last?
Will the NHS replace my CPAP parts?
Can I wash my memory foam CPAP cushion?
What happens if I don't replace my CPAP supplies on schedule?
Why does my CPAP mask suddenly leak when it fitted fine before?
How can I make my CPAP parts last longer?
How much does it cost to keep a CPAP setup on schedule?
More UK-specific CPAP guidance.
This guide is for general educational purposes only and is not a substitute for personalised medical advice. Replacement intervals vary by manufacturer and model — always follow the instructions supplied with your own equipment.
Never adjust your prescribed pressure settings yourself. If your symptoms return, your therapy feels less effective, or you experience persistent discomfort, speak to your sleep clinic or CPAP provider.
