Making saline nasal spray at home takes about five minutes and three ingredients: non-iodized salt, baking soda, and safe water. The basic ratio is 1 teaspoon of a salt-and-baking-soda mixture stirred into 8 ounces of lukewarm water. Getting the proportions and water safety right is what separates a soothing rinse from one that stings or, worse, introduces harmful organisms into your nasal passages.
The Standard Isotonic Recipe
An isotonic solution matches the salt concentration of your body’s own fluids, which is why it feels comfortable rather than burning. To make one, start by mixing a dry base: combine 3 teaspoons of non-iodized salt with 1 teaspoon of baking soda. Store this dry mix in a small airtight container. Each time you need a batch of spray, stir 1 teaspoon of the mixture into 8 ounces (1 cup) of lukewarm water until fully dissolved.
This produces a solution at roughly 0.9% salinity, the same concentration used in standard medical saline. It moisturizes dry nasal tissue, loosens mucus, and rinses out allergens and irritants without disrupting the delicate lining inside your nose.
Why Each Ingredient Matters
Use non-iodized salt, sometimes labeled as pickling salt or canning salt. Regular table salt contains iodine and anti-caking agents that can irritate nasal membranes. Kosher salt works too, as long as it has no additives. Check the ingredient list: it should say only “salt” or “sodium chloride.”
Baking soda (pure sodium bicarbonate) acts as a buffer that brings the solution closer to your body’s natural pH. Without it, the salt water can sting, especially if your nasal passages are already inflamed. It’s optional, but most people find the solution noticeably more comfortable with it included.
Water Safety Is Non-Negotiable
This is the single most important step. Tap water can contain low levels of bacteria and, rarely, amoebas like Naegleria fowleri that are harmless if swallowed but dangerous when introduced directly into nasal passages. The CDC recommends using only one of the following:
- Store-bought distilled or sterile water. Look for bottles labeled “distilled” or “sterile.”
- Boiled tap water. Bring water to a rolling boil for 1 minute (3 minutes if you live above 6,500 feet elevation), then let it cool to lukewarm before mixing.
Never use water straight from the tap, a garden hose, or a filtered pitcher. Home water filters do not remove all microorganisms. If you boil a larger batch of water, store what you don’t use immediately in a clean, sealed container.
A Stronger Version for Sinus Congestion
If you’re dealing with thick mucus from a sinus infection or chronic sinusitis, a slightly saltier (hypertonic) solution can draw more fluid out of swollen tissue. Hypertonic saline runs at about 2 to 3% concentration instead of the standard 0.9%. To make it, simply double the amount of dry mix you add to the same 8 ounces of water, using 2 teaspoons instead of 1.
Hypertonic saline is more effective at reducing congestion, but it can also sting more, especially during the first few uses. If it feels too harsh, go back to the standard recipe. Research from the University of Wisconsin found that daily hypertonic irrigation improved symptoms in people with chronic sinusitis, so it’s worth trying if the isotonic version isn’t giving you enough relief.
How to Use It as a Spray
Pour the finished solution into a clean nasal spray bottle. You can buy empty spray bottles at most pharmacies, or reuse one from a store-bought saline product after washing it thoroughly. Tilt your head slightly forward, insert the tip just inside one nostril, and give one or two gentle sprays. Repeat on the other side. Breathe out gently through your nose afterward to clear excess liquid.
For a more thorough rinse, a squeeze bottle or neti pot delivers a larger volume of solution and does a better job flushing out deep congestion. A spray bottle is better suited for quick moisture throughout the day.
Most people use saline spray once or twice a day. If you’re congested from a cold or allergies, you can spray every four hours as needed. There’s no medication in it, so there’s no rebound effect like you’d get from medicated decongestant sprays.
Keeping Your Equipment Clean
Rinse your spray bottle or neti pot with distilled or boiled water (not tap) after every use and let it air dry completely. Bacteria thrive in warm, moist environments, so leaving a damp bottle sealed creates exactly the conditions you want to avoid. Replace spray bottles every few weeks, or sooner if you notice discoloration or buildup around the nozzle.
How Long the Solution Lasts
Make a fresh batch every 24 hours. Homemade saline has no preservatives, so bacteria can start growing in it relatively quickly at room temperature. If you made a batch in the morning and haven’t used it all by the next day, dump it and mix a new one. The dry salt-and-baking-soda mix, on the other hand, keeps indefinitely in a sealed container at room temperature, so preparing a large jar of it means each new batch takes just seconds.
Quick-Reference Measurements
- Dry mix: 3 teaspoons non-iodized salt + 1 teaspoon baking soda
- Isotonic spray: 1 teaspoon dry mix per 8 oz lukewarm distilled or boiled water
- Hypertonic spray: 2 teaspoons dry mix per 8 oz lukewarm distilled or boiled water
- Larger batch (isotonic): 2 teaspoons non-iodized salt + 1 teaspoon baking soda per quart of distilled water
If you experience persistent burning even with the isotonic recipe and baking soda, try reducing the salt slightly. Everyone’s nasal tissue is a little different, and minor adjustments to the ratio are perfectly fine as long as the solution doesn’t feel like plain water, which can actually be more irritating than mildly salted water.