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I checked with an experienced pharmacist on the correct ratio/proportions necessary to make a nasal saline 0.9% isotonic solution. (Isotonic means "same as body" saline levels.) Use 250 ml (1 cup) of distilled water (or purified by boiling 5 minutes then cooled). To this, add 1/3 or 2.25 grams of non-iodized canning or pickling salt.
Note: some sites say anywhere from 1/4 to 1 tsp. The correct proportion to achieve 0.9% is exactly 1/3 teaspoon.
Store in a sealed/covered container for up to 5 days. Use the solution as close to body temperature as possible for better absorption.
This is a guide about homemade saline nasal spray. Saline spray is a great remedy for allergies or a stuffy nose. You can buy it at the store or make your own solution.
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By Marie from West Dundee, IL
Don't for get the water has to be boiled first and the bottle sterilized, especially if you're going to store it for any length of time! (12/11/2007)
Actually the water used for making a saline solution should be distilled water available from your local drug store. (12/11/2007)
Make sure that you toss any left over solution after 24 hours so bacteria doesn't grow!! - from a nurse (02/14/2008)