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Message: [QUOTE="PGB1, post: 275448, member: 7718"] The figures I put in # 17 are Total Chlorine. Free always tested lower because it dissipates quicker than I can test. (Lab grade instruments that I use for cooling tower work) I believe that Detroit water is high in chlorine due to the large amount of wood water mains that are still in use. They also have periodic chlorination stations throughout the 1,079 square mile service area. When I worked in a stadium, the shop was 252 feet above the water main. In the morning, the first guy in would run the sinks until the nearly over-powering chlorine odor would leave. I think the free chlorine would rise to the top of the system during periods of non-use. The roof fire hydrants were even worse! [/QUOTE]