Nebulisers & saline therapy, explained without the hype
Jet or mesh? Prescribed or over-the-counter saline? A nebuliser turns liquid medicine into a fine mist you breathe in — but it's a clinical device, not a wellness gadget. Here's how the types differ, why cleaning matters more than the model, and when a nebuliser should only be used under medical guidance.
A nebuliser delivers medicine to your lungs. What goes in it — bronchodilators, antibiotics, steroids or saline — and at what strength is a clinical decision. Nebulised saline above 0.9% (hypertonic, e.g. 3% or 7%) can trigger bronchospasm in some people and is usually started only after a supervised challenge test with a respiratory physiotherapist. Don't buy or borrow a nebuliser to self-treat a chest condition. Speak to your GP, a pharmacist, your respiratory team or NHS 111 about whether you need one at all — and if so, which device and solution suit you.
Jet vs mesh nebulisers
Both turn liquid into an inhalable mist; they do it differently, and the right one depends on what you're nebulising. Your respiratory team will usually specify the device — some medicines are only licensed with a particular type.
| Type | How it works | Best for | Watch for |
|---|---|---|---|
| Jet (compressor) | An air compressor blasts air through the liquid to create mist; chamber, tubing and a mask or mouthpiece | Thicker medicines and suspensions (some antibiotics, steroid suspensions); robust, lower up-front cost | Noisy, bulky, mains-powered; tubing and filters need replacing; slower treatments |
| Mesh (vibrating mesh) | A vibrating mesh full of microscopic holes pushes liquid through into a fine mist | Quiet, portable, battery option; fast, efficient delivery; good for travel | Thick suspensions can clog the tiny holes; needs careful rinsing every use; pricier; mesh can wear out |
General comparison for guidance only — always follow your prescribed device and medicine instructions.
What to look for in a nebuliser
Once your clinician has confirmed you need one and which type, these are the practical things that separate a device you'll keep using safely from one that ends up unused in a cupboard.
Medicine compatibility
Confirm the device is approved for YOUR medicine — some drugs (e.g. certain antibiotics and steroid suspensions) are only licensed with specific nebulisers. The medicine, not the marketing, decides.
CE / UKCA marking
It's a medical device. Look for proper UKCA or CE marking and a manufacturer who supplies clear cleaning and servicing instructions in English.
Easy, full disassembly
Every part that touches the mist must come apart for washing and air-drying. Awkward-to-clean chambers are an infection risk, not a convenience.
Replaceable consumables
Check the cost and availability of replacement chambers, masks, filters and (jet) tubing before you commit — these are ongoing, not one-off.
Servicing and warranty
Compressors and mesh heads wear. A clear warranty and UK servicing route matter more than a long feature list.
Mask or mouthpiece fit
A mouthpiece usually delivers more medicine to the lungs than a loose mask; for children or frail users a well-fitting mask may be needed. Ask your team which is right.
Clean it properly — every single time
This is the part most people get wrong, and it's the part that matters most. Contaminated nebulisers can deliver bacteria and fungi straight into already-vulnerable lungs. Always follow your device's own manual — these are the common principles, not a substitute for it.
After every use: wash the parts
Take the chamber, mask and mouthpiece apart and wash them in warm soapy water (or as the manual directs). Don't wash the jet tubing — keep it dry.
Rinse mesh devices straight away
On a mesh nebuliser, rinse the mesh and cup immediately so medicine doesn't dry in the microscopic holes and clog or harbour microbes.
Air-dry — never towel-dry
Lay parts on a clean lint-free surface or paper towel and let them air-dry fully. Cloth towels and active drying can re-introduce bacteria; tap-water rinsing and outdoor drying both raise contamination risk.
Disinfect regularly
Disinfect the removable parts on the schedule your manual gives (often weekly). If a device has sat unused for more than 24 hours, clean and disinfect it again before the next dose.
Replace consumables on time
Change filters and tubing per the manufacturer's schedule (commonly every 1–3 months, sooner if discoloured or damp), and replace the chamber/mesh as it wears.
Store clean and dry
Reassemble only once everything is bone-dry, and store away from dust and damp. A clean device dried wrong is still a dirty device.
Saline therapy: 0.9% vs hypertonic
- Standard 0.9% (isotonic) saline is gentle and unlikely to cause side effects — used to loosen and clear secretions
- Hypertonic saline (3%, 6%, 7%) can help clear stubborn mucus in conditions such as bronchiectasis
- On the NHS, both 0.9% ampoules and stronger saline can be prescribed where clinically appropriate
- Hypertonic saline can cause chest tightness, wheeze, cough or sore throat — usually short-lived, but real
- It's typically started only after specialist assessment and a supervised challenge test for bronchospasm risk
- Saline isn't a substitute for prescribed bronchodilators, antibiotics or steroids — it's an adjunct, used on advice
- Self-buying 'saline pods' to nebulise for a general cough is not the same as prescribed airway-clearance therapy
A nebuliser is a genuinely useful, evidence-backed device — for the right person, with the right medicine, cleaned the right way. The trap is treating it as an over-the-counter wellness gadget. Mesh wins on portability and quiet; jet wins on handling thicker medicines and cost. For most people the choice is made by their respiratory team, and the device matters far less than the cleaning routine and the correct solution.
People with a diagnosed respiratory condition (e.g. bronchiectasis, severe COPD or asthma, CF) who've been advised to nebulise, and who can keep up a strict cleaning regime.
Self-treating an undiagnosed cough; using hypertonic saline without specialist sign-off; and skimping on cleaning — a poorly maintained nebuliser can do more harm than good.
Common questions
Do I need a prescription for a nebuliser?
You can buy a nebuliser device without a prescription, but the medicines you'd put in it (bronchodilators, antibiotics, steroids and hypertonic saline) generally require one. More importantly, whether you should be nebulising at all is a clinical decision — speak to your GP, pharmacist or respiratory team first.
Can I just nebulise saline for a cough?
Nebulised 0.9% saline is sometimes used to help loosen secretions, but it's not a fix for a general cough and isn't a substitute for proper assessment. Persistent or worsening cough, breathlessness or coughing up blood needs medical advice — start with a pharmacist, your GP or NHS 111.
Why does hypertonic saline need a supervised test?
Stronger saline (3% and above) can cause the airways to tighten (bronchospasm) in some people. Because of this risk, a respiratory physiotherapist usually carries out a supervised challenge test before regular use, and any side effects like wheeze or chest tightness are monitored.
Is a mesh nebuliser better than a jet one?
Not universally. Mesh devices are quieter, faster and more portable; jet devices handle thicker medicines and suspensions better and cost less up front. Some medicines are only licensed with a specific device — so the 'better' one is the one that matches your prescription and that you'll clean properly.
How often should I replace the parts?
Follow your manufacturer's schedule. As a rough guide, filters and tubing are often replaced every one to three months (sooner if discoloured or damp), and chambers, masks and mesh heads are replaced as they wear. Check your manual — schedules vary by device.
Choose the device, not the hype
A nebuliser is a clinical tool. Get the diagnosis and the prescription right first, then pick a device you can clean faithfully every single day. Browse our other home-care and monitoring guides to learn what to look for before you buy anything.