This is from the link above on this forum MASTER MINERAL SOLUTION (MMS):
www.jimhumble.co/how-to-make-mms
Test That Your MMS is Good
You now have MMS, but at this point, before bottling for storage, it is important to do the following test to be sure you have hit the mark of the true Jim Humble MMS formula. Here is how to test that you have the correct formula:
— MMS is a 22.4% solution of sodium chlorite in water. One hundred milliliters of MMS liquid should weigh 122 grams, this is the ideal. If it falls in the range of 120 grams to 124 grams it is usable, but 122 grams, or very close to it, is best.
— Take a container that is marked to measure 100 milliliters, be sure it is clean and dry at the start. (A graduated cylinder with milliliters marked on it works well for this.) Put the container on the scale and then press the tare button, as this must be a precise measurement. The tare feature will set the scale to zero grams when you put the completely empty container on the scale. Carefully pour your MMS liquid into the container on the scale until it reaches the 100 ml mark. If you accidently go over 100 ml, use a clean plastic spoon to remove some of the liquid, until you get it exactly to 100 ml.
— The 100 ml you have measured out should weigh 122 grams.
(Note: The solution you make of 22.4% sodium chlorite in water is denser than just plain distilled water, so for the test, if you measure out the 100 ml of your MMS liquid it will weigh more than 100 ml of plain water, because you have added the sodium chlorite powder to it. The weight you are shooting for is 122 grams for 100 ml of the MMS solution you just mixed up.)
— If you have gone over the 122 grams, say it comes out to 123 or 124 you can carefully add more distilled water (but first pour the 100 mls you weighed out back into your total solution before adding more water). Then add just a little more distilled water at a time, to your entire mixture. After adjusting, do the above test again and see if you can get it to 122 grams.
— If you come up under 122 grams, say you are at 120 grams, you can add in a little more sodium chlorite powder. Again, pour the 100 mls you weighed out back into your solution before adding more sodium chlorite powder, so you are adding to your entire solution. Add a little bit at a time, stirring again to make sure it’s fully dissolved, then do the above test again to see if it’s come up closer to exactly 122 grams.
(Note: I suggest adding a very little water or powder at a time to adjust, so you don’t drastically go too far. This process is somewhat like “adjusting the spices” if you were cooking a meal. It’s best to go low and slow until you get it right.)