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The comment of high chlorides is a possibility. Also check microbiological fouling. This can be noticed in local areas, depending on flow and nutrients. Michael Janowiak

Hi Abbey, Xavier and Jay are correct and I've seen this many times in my 30+ years in the mechanical water filtration industry. You might also want to check to make sure the MER has been properly grounded. Stray voltage can also be the cause of early ...

Don/Abbey, SS Plate and frame heat exchangers normally corrode up by the crevices or gaskets because of concentration cells developing - A solution of 100 ppm chloride can concentrate near the gasket to a much higher level, depending on flow and other ...