Sinus irrigation flushes saline solution through your nasal passages to clear out mucus, allergens, and irritants. It works by thinning sticky mucus and physically washing it away, while the flow of liquid stimulates the hair-like cells lining your sinuses to move mucus out more effectively. The technique is straightforward, but getting the details right matters for both comfort and safety.
How Sinus Irrigation Works
Your sinuses are lined with a thin layer of mucus sitting on top of microscopic, hair-like structures called cilia. These cilia beat in coordinated waves to push mucus (and whatever it has trapped) toward your throat. When you’re congested from allergies, a cold, or chronic sinusitis, that mucus layer thickens and the system slows down.
Saline irrigation helps in two ways. First, the salt water physically flushes out thickened mucus, bacteria, and inflammatory debris. Second, the pressure and flow of the liquid across the sinus lining triggers cells to release more thin, watery fluid and drives the cilia to beat faster. Hypertonic saline (slightly saltier than your body’s own fluids) pulls extra water out of swollen tissue through osmosis, which can further reduce congestion. A meta-analysis in the Brazilian Journal of Otorhinolaryngology found that hypertonic saline irrigation outperformed isotonic saline for reducing nasal secretion, congestion, headache, and overall symptoms in people with chronic sinusitis.
Choosing Safe Water
This is the single most important safety step. Never use plain tap water. Tap water can contain low levels of bacteria and, in rare cases, amoebas that are harmless if swallowed but dangerous when introduced directly into nasal passages. In 2011, two adults in Louisiana died from a brain-eating amoeba (Naegleria fowleri) after using unsterilized tap water in neti pots. Their municipal water had been treated, but not enough to eliminate the organism. These were the first such cases linked to treated U.S. tap water.
The CDC and FDA both recommend using only these water types for sinus rinsing:
- Distilled or sterile water purchased from a store (the label will say “distilled” or “sterile”)
- Boiled tap water brought to a rolling boil for 1 minute (3 minutes above 6,500 feet elevation), then cooled to lukewarm
- Filtered water passed through a filter specifically designed to trap infectious organisms (look for filters labeled for this purpose on the CDC’s website)
Previously boiled water can be stored in a clean, sealed container but should be used within 24 hours.
Making the Saline Solution
A basic isotonic solution matches the saltiness of your body’s own fluids, which means it won’t sting or irritate your nasal lining. To make it, dissolve 1 teaspoon of non-iodized salt (pickling salt or canning salt works well) into 2 cups of your prepared water. Adding half a teaspoon of baking soda buffers the solution, making it gentler on sensitive tissue. Iodized table salt can cause irritation, so avoid it.
For a hypertonic solution, which may be more effective for heavy congestion, use a slightly heaped teaspoon of salt per 2 cups of water. If it stings, back off to the standard amount. The water should be lukewarm, roughly body temperature. Too cold and it will be uncomfortable. Too hot and you risk burning delicate tissue.
Pre-mixed saline packets are sold alongside most irrigation devices and take the guesswork out of the ratio. They’re convenient and consistently measured, which makes them a good option if you irrigate daily.
Picking a Device
Several types of devices work well, and the choice mostly comes down to personal preference:
- Neti pot: A small spouted pot (ceramic or plastic) that uses gravity to pour saline through your nose. Gentle flow, good for beginners.
- Squeeze bottle: A plastic bottle you squeeze to push saline through with mild pressure. Delivers more volume and slightly more force than a neti pot, which can reach deeper into the sinuses.
- Bulb syringe: A rubber bulb that delivers a short burst of saline. Common for use with young children.
- Powered irrigator: A battery or electric device that produces a steady, pulsating stream. Hands-free once positioned.
High-volume devices like squeeze bottles and neti pots typically use 120 to 240 mL (about 4 to 8 ounces) per side. Low-volume options like spray bottles deliver much less and are better suited for moisturizing than deep flushing.
Step-by-Step Technique
Stand or sit over a sink. Lean your head down and forward so you’re looking into the basin. Tilt your head to one side so one ear points toward the sink and the other toward the ceiling. Think of it as positioning your head so water can flow in the top nostril and spill out the bottom one.
Place the spout or nozzle snugly into your upper nostril. If you’re using a squeeze bottle, gently squeeze. If you’re using a neti pot, tip it to let gravity do the work. Breathe through your mouth the entire time. The saline will flow through your nasal cavity, around the septum, and drain out the lower nostril. Some may trickle down your throat, which is harmless.
Use about half the solution on one side, then switch. Tilt your head the other direction, insert the device into the opposite nostril, and repeat. When you’re finished, gently blow your nose to clear remaining fluid. Avoid blowing hard, which can push water into the ear canals and cause a feeling of fullness or pressure.
Clinical guidelines recommend the head-down-and-forward position for high-volume irrigation (squeeze bottles, neti pots). If you’re using a low-volume spray, tilting your head back slightly with your nose toward the ceiling is more effective at getting the solution where it needs to go.
How Often to Irrigate
During a cold or allergy flare, irrigating once or twice a day is typical. For chronic sinusitis, daily use is common and well-tolerated. In a survey of 134 patients with chronic sinus issues, 95% found nasal irrigation simple and easy, and about 85% described the treatment as comfortable. You can irrigate up to three times a day during acute congestion, but if your nasal passages start feeling dry or irritated, scale back.
Some people use sinus irrigation as a long-term daily habit, especially during allergy seasons or in dry climates. Others reserve it for when symptoms flare. Both approaches are reasonable.
Cleaning Your Device
After every use, rinse the device thoroughly with safe water (distilled, sterile, or previously boiled) and let it air dry completely. Bacteria and mold thrive in moist, enclosed containers. The FDA specifically warns against rinsing devices with tap water, since that reintroduces the same organisms you’re trying to avoid.
Replace plastic squeeze bottles every few months, or sooner if you notice discoloration or residue that won’t wash away. Ceramic neti pots last longer but should still be inspected for cracks where bacteria can hide. If your device came with specific cleaning instructions from the manufacturer, follow those.
Sinus Irrigation for Children
Nasal irrigation is safe for babies starting around 9 months old, once they can sit up and lean forward. Young children can’t blow their noses effectively, so flushing with saline is one of the best ways to clear congestion and has been shown to reduce the need for both over-the-counter and prescription medications, including antibiotics.
Use a device designed specifically for infants or small children, with a tip sized for tiny nostrils. The saline recipe is the same: 1 teaspoon of non-iodized salt and an optional teaspoon of baking soda per 2 cups of sterile water. Be especially careful about water safety, since young children’s immune systems are still developing. For babies, you can repeat the rinse up to three times per day.
Common Side Effects
Most people tolerate sinus irrigation well, but a few minor issues are common, especially when you’re new to it. A brief stinging or burning sensation usually means the salt concentration is off or the water is too warm or too cold. Ear fullness or popping can happen if you blow your nose too forcefully afterward or if you squeeze the bottle too hard. Letting the solution drain passively and blowing gently prevents this. A small amount of saline draining from your nose for several minutes after you finish is normal. Just lean forward over the sink and let it clear.
If you experience persistent ear pain, nosebleeds, or worsening symptoms after irrigation, stop and check your technique and solution. Rarely, irrigation can push infected material into the sinuses or ear canals, particularly if you have significant blockage from polyps or severe swelling.