The 4-hour requirement is only for a worst case scenario. Unfortunately, the EPA has chosen to not allow the consumer easy access to this information. See below the instructions I include with MP1 tabs in my survival kits and vests, taken from the EPA test results:




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Doug Ritter
Editor
Equipped To SurviveŽ
Chairman & Executive Director
Equipped To Survive Foundation
www.KnifeRights.org
www.DougRitter.com