Mia, I have been using unactivated Miracle-Mineral-Supplement for 4 years as have many thousands of others, with not one single problem. It is used in very low ppm doses of about 1 - 2 drops per liter of water.
MMS, or sodium chlorite, has been used this way for over 40 years, and there is WAY more information on its use in this way than there is about using it in the pre-activated form.