Hello, The fun thing is there is ALWAYS something to learn! I Googled “hydrogen peroxide side effects” and found things like this: http://www.webmd.com/drugs/2/drug-76035/hydrogen-peroxide/details and http://skin.emedtv.com/hydrogen-peroxide/hydrogen-peroxide-side-effects.html . Both sites discourage drinking peroxide without watering it down. And there have been serious side effects for some people.
I do try to watch out for people’s welfare and my earlier advice didn’t warn particularly sensitive people of dangers peroxide may have for them. From the second link: “Low strengths used on the skin or in mouthwashes are unlikely to cause serious side effects.” The strength of the peroxide from a forty gallon heater is .01875% if two pints were used. Anyway, done wrong, peroxide can cause trouble, Thanks KULTULZ!