Making saline nose spray at home takes about five minutes and three ingredients: salt, baking soda, and safe water. The basic recipe produces an isotonic solution, meaning it matches the salt concentration of your body’s own fluids, so it won’t sting or irritate your nasal passages.
The Recipe
For a full batch, combine:
- 1 teaspoon salt (pickling salt or kosher salt)
- ½ teaspoon baking soda
- 1 quart (about 1 liter) of safe water
The baking soda is a buffering agent. It brings the solution’s pH closer to your body’s natural level, which makes it gentler on the tissue inside your nose. Some sources call it optional, but if you find plain salt water slightly irritating, the baking soda is worth adding.
If you only need a small amount to fill a spray bottle, cut the recipe in half or quarters and keep the same proportions.
Choosing the Right Salt
Use non-iodized salt. Pickling salt and kosher salt both work well because they’re free of additives. Regular table salt contains iodine and anti-caking agents that can irritate nasal tissue or leave a residual taste. If the label says “iodized,” skip it.
Water Safety Matters
This is the most important step. Tap water straight from the faucet can contain low levels of bacteria and, in rare cases, harmful organisms like the amoeba that causes a dangerous brain infection. The CDC recommends using one of these water sources for any nasal rinse:
- Store-bought distilled or sterile water (labeled as such on the bottle)
- Boiled tap water, cooled to lukewarm before use
If you boil, bring the water to a rolling boil for 1 full minute. At elevations above 6,500 feet, boil for 3 minutes. Then let it cool completely before mixing in the salt and baking soda.
Isotonic vs. Hypertonic Solutions
The recipe above produces an isotonic solution at roughly 0.9% salt concentration, the same saltiness as your blood and tissue fluid. This is the standard choice for daily use and general congestion relief.
A hypertonic solution has a higher salt concentration. Some people use a slightly saltier mix (closer to 2 or 3 teaspoons of salt per quart) to draw more moisture out of swollen nasal tissue during a bad cold or sinus infection. It can be more effective at reducing congestion, but it also tends to sting more. If you’re new to nasal rinsing, start with the isotonic recipe and adjust from there.
How to Use It
Pour the cooled solution into a clean nasal spray bottle. You can buy empty spray bottles at most pharmacies, or reuse a thoroughly cleaned commercial saline spray bottle. Tilt your head slightly forward, insert the nozzle into one nostril, and give a few gentle pumps. The saline loosens dried mucus, washes out allergens and irritants, and helps moisturize dry nasal passages. Repeat on the other side.
Unlike medicated decongestant sprays, saline doesn’t cause rebound congestion (the cycle where your nose gets more stuffed up the more you spray). You can use it multiple times a day without worrying about overuse or dependency.
Storage and Shelf Life
Homemade saline doesn’t contain preservatives, so bacteria can start growing in it within 24 hours at room temperature. Store any leftover solution in the refrigerator, and discard whatever you haven’t used after one day. For convenience, many people just make a fresh small batch each morning.
Keeping Your Bottle Clean
A dirty spray bottle defeats the purpose of using sterile water. After each use, rinse the bottle, cap, and any internal straw or tube under running water. Every few days, give it a deeper clean: add a few drops of dish soap, shake well, squeeze the soapy water through the nozzle, then rinse thoroughly until no soap remains. Let all the parts air-dry on a clean paper towel.
For extra disinfection, you can microwave the disassembled bottle and parts for about 40 seconds (make sure they’re microwave-safe first). Replace your spray bottle entirely every three months, since plastic bottles develop micro-scratches over time that can harbor bacteria even after cleaning.