Making saline spray at home requires just three ingredients: non-iodized salt, baking soda, and sterile water. The basic ratio is 1 teaspoon of a salt-and-baking-soda mix dissolved in 8 ounces (1 cup) of lukewarm water. The whole process takes under five minutes, but getting the details right matters for both comfort and safety.
The Standard Recipe
Start by making a dry mix you can store and use over time. Combine 3 teaspoons of non-iodized salt with 1 teaspoon of baking soda in a small airtight container. This is your base mixture, recommended by the American Academy of Allergy, Asthma & Immunology.
When you’re ready to make a batch of spray, add 1 teaspoon of the dry mix to 8 ounces of lukewarm water. Stir until everything dissolves. This produces an isotonic solution, meaning its salt concentration roughly matches what’s already in your body, so it won’t sting or burn. If you do feel stinging, use a little less of the dry mix next time.
Why These Specific Ingredients
Use non-iodized salt (sometimes labeled “pickling salt” or “canning salt”). Iodine, which is added to regular table salt, can be toxic to the delicate lining inside your nose. Anti-caking agents found in standard table salt can also irritate your nasal passages. Pure, additive-free salt avoids both problems.
The baking soda (sodium bicarbonate) acts as a buffer. Plain salt water is slightly acidic, which can cause a burning sensation. Baking soda brings the pH closer to neutral, making the spray gentler on sensitive tissue. It’s a small addition, but it makes a noticeable difference in comfort, especially if you’re using the spray multiple times a day.
Water Safety Is Critical
This is the part people most often get wrong, and it’s the most important. Tap water can contain low levels of bacteria and, in rare cases, a dangerous organism called Naegleria fowleri. Swallowing these in drinking water is harmless, but introducing them directly into your nasal passages is not. The CDC recommends using only water that is distilled, labeled sterile, or boiled.
If you’re boiling tap water, bring it to a rolling boil for 1 full minute. At elevations above 6,500 feet, boil for 3 minutes. Let it cool to lukewarm before mixing. Store any unused boiled water in a clean, sealed container. Never use water straight from the tap, a filtered pitcher, or a garden hose, no matter how clean it looks.
Isotonic vs. Hypertonic Solutions
The recipe above creates an isotonic spray, which is gentle enough for daily use and works well for general moisture and clearing out dust or pollen. A hypertonic solution uses a higher concentration of salt, typically between 1.25% and 3%. This draws more fluid out of swollen nasal tissue, which can help when you’re dealing with significant congestion from colds or allergies.
To make a mildly hypertonic version, simply add a bit more of the dry mix to the same 8 ounces of water. There’s no single “best” concentration. Research on hypertonic saline for allergic rhinitis has found consistent symptom relief across a range of concentrations, but the wide variation in study methods means there’s no universally agreed-upon formula. Start with the standard recipe and increase the salt slightly if you want a stronger decongestant effect. If it stings, back off.
How to Use the Spray
Pour the finished solution into a clean spray bottle (a recycled nasal spray bottle works, or you can buy empty ones at most pharmacies). Then follow these steps for each nostril:
- Keep your head level. Don’t tilt it forward or backward.
- Insert the nozzle gently just inside one nostril.
- Aim toward the outer wall of your nose, pointing roughly toward the outside corner of the eye on the same side. Never aim the spray toward the center of your nose (the septum), which is more sensitive and prone to irritation.
- Squeeze or pump once while inhaling gently through your nose with your mouth closed. Inhaling too hard sends the solution straight to the back of your throat instead of coating your nasal passages.
- Repeat on the other side, aiming the nozzle toward the outer wall of the opposite nostril.
If solution drips down your throat, you’re either using too much force or tilting your head back. Adjust your angle and try a softer squeeze.
Storage and Shelf Life
The dry salt-and-baking-soda mix keeps indefinitely in an airtight container at room temperature. The mixed liquid solution is a different story. Once you’ve added water, refrigerate the solution and use it within three days. After that, discard whatever is left and make a fresh batch. Room-temperature saline with no preservatives is a hospitable environment for bacteria, so don’t push the timeline.
Keeping Your Equipment Clean
A dirty spray bottle defeats the purpose of using sterile water. After each use, wash the bottle and nozzle with a small amount of dish soap, rinse thoroughly, and let it air dry. Replace the spray bottle every three months, or sooner if it becomes discolored. Each person in your household should have their own bottle. Sharing spreads bacteria and viruses directly into the nasal passages, which is exactly the kind of exposure you’re trying to avoid.