When being questioned about the reasons GM switched back to Detroit water, experts explains that the high levels of chloride in Flint water, not the lead, corroded the engines. GM engines were not built with a system to sustain chloride. On the other hand, chloride is good for cleaning up the human body. As for the lead, experts claimed that people can just urine them out. So if you drink more lead-based water, the faster the lead pass through your body.