I just made mine with kosher salt and dw (1/2 teaspoon/half cup - make sure there are no additives in the salt
1/2 tsp salt ~3 grams. 1/2 cup water ~118 ml (118 grams). 3/118*100 = 2.5% saline.
For .9% saline solution in 1/2 cup water you need 1.062 grams of salt or ~1/6 of a teaspoon. 1.062/118*100 = .9% saline.
1/4 tsp salt in 3/4 cup of water is close @.86% saline. A touch under 3/4 cup of water to 1/4 tsp of salt should be close enough.
Nothing wrong with 2.5%, you just have to keep that in mind when following recipes. Most recipes use the .9% saline.
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