Flushing your sinuses with salt water, called nasal irrigation, is one of the simplest and most effective ways to relieve congestion, clear mucus, and reduce sinus pressure. The basic idea: you pour a saline solution into one nostril and let it drain out the other, physically washing out mucus, allergens, and irritants. Here’s how to do it safely and get the best results.
Why Sinus Flushing Works
Saline irrigation does more than just rinse out visible mucus. The salt water thins thick mucus so it moves more easily, reduces swelling in the nasal lining, and physically removes allergens, bacteria, and inflammatory compounds that keep your sinuses irritated. It also disrupts bacterial biofilms, the sticky colonies of bacteria that cling to sinus walls and can perpetuate infections.
Hypertonic saline (slightly saltier than your body’s own fluids) has been shown in lab studies to increase the speed of cilia, the tiny hair-like structures that sweep mucus out of your sinuses. Faster cilia means better drainage even after the rinse is over.
What You Need
You’ll need three things: a rinsing device, safe water, and salt mix.
- Device: A neti pot (gravity-fed ceramic or plastic pot), a squeeze bottle, or a bulb syringe. Squeeze bottles tend to work better because they use gentle positive pressure to push the solution deeper into your sinuses. A randomized trial of 116 patients with allergic rhinitis found that squeeze bottle users had significantly greater improvement in nasal symptoms over four weeks compared to syringe users. Both types had high satisfaction scores, so use whatever you’re most comfortable with.
- Water: Never use plain tap water. Use distilled or sterile water from the store, or boil tap water at a rolling boil for 1 minute (3 minutes above 6,500 feet elevation) and let it cool to lukewarm. This is non-negotiable.
- Salt mix: You can buy premixed saline packets or make your own. The American Academy of Allergy, Asthma & Immunology recommends mixing 3 teaspoons of non-iodized salt with 1 teaspoon of baking soda and storing the dry mix in a sealed container. When you’re ready to rinse, stir 1 teaspoon of the mix into 8 ounces (1 cup) of lukewarm water. For children, use half a teaspoon in 4 ounces of water.
The baking soda buffers the solution so it’s gentler on your nasal lining. If the rinse stings or burns, use a little less of the dry mix next time.
Step-by-Step Technique
Stand over a sink. Tilt your head down and to one side so one nostril is directly above the other. Breathe through your open mouth the entire time.
Place the spout of your neti pot or the tip of your squeeze bottle just at the entrance of the upper nostril. Don’t push it deep inside. If you’re using a neti pot, let gravity pull the water through. If you’re using a squeeze bottle, apply gentle, steady pressure. The solution will flow into the upper nostril, travel through your nasal passages, and drain out the lower nostril into the sink.
If water runs into your mouth instead, tilt your head further downward. Use about half the solution on one side, then switch: tilt your head the other direction and repeat through the other nostril. When you’re done, gently blow your nose to clear any remaining fluid. Don’t blow hard, as that can push water into your ear canals.
How Often to Rinse
When you’re dealing with active congestion from a cold, sinus infection, or allergy flare, rinsing once or twice a day is safe and effective. Many people also rinse a few times a week as a preventive measure, especially during allergy season or in dry winter air. There’s no strict upper limit, but most guidance suggests once or twice daily is the sweet spot for symptom relief without irritating your nasal lining.
Why Water Safety Matters
This is the one part of sinus flushing you cannot cut corners on. Tap water can contain a rare but deadly amoeba called Naegleria fowleri, which causes a brain infection called primary amebic meningoencephalitis. Between 2003 and 2012, three of the 31 U.S. cases of this infection were linked to nasal rinsing with contaminated tap water, including two patients who used neti pots. The infection is almost universally fatal.
The documented cases involved untreated well water and water systems without detectable chlorine. Municipal water supplies are generally treated, but the CDC still recommends using only distilled, sterile, or previously boiled water for any sinus rinse. It takes about five minutes to boil and cool a cup of water. That small step eliminates the risk entirely.
Cleaning Your Equipment
After every use, wash your neti pot or squeeze bottle with distilled, sterile, or previously boiled water (not tap water). Let the device air-dry completely between uses, ideally upside down on a clean towel. Bacteria and mold can grow inside damp containers, and you don’t want to rinse your sinuses with a contaminated device. Replace squeeze bottles every few months, or sooner if you notice discoloration or residue that won’t wash away.
When Sinus Flushing May Not Help
If your nasal passages are completely blocked, the saline won’t flow through and the rinse will just back up. In that case, try using a nasal decongestant spray about 10 minutes before irrigating to open the passages enough for the solution to pass. People with frequent nosebleeds, a recent nasal or sinus surgery, or ear tubes should check with their doctor before irrigating, since the pressure could push fluid where it shouldn’t go.
Sinus flushing is a supplement to other treatments, not a replacement. It works well alongside allergy medications, nasal steroid sprays, and antibiotics when needed. But for everyday congestion, seasonal allergies, or the lingering stuffiness of a cold, a simple salt water rinse is often the fastest relief you’ll find.