thanks.
i'm guessing not is MIC because not found Biofilm in pipe and found corrosion around the pipe.
process : raw water(lake,river) >>> sand filter >>> Activated carbon >>> cation exchanger >>> anion exchanger >>> storage
(i'm sorry)
acttivated carbon can absorb some Cl. but after Activated...
pipe all line : Austenitic ss 304 and welding (weld decay)
process : raw water(lake,river) >>> Activated carbon >>> cation exchanger >>> anion exchanger >>> storage
found pitting corrosion on pipe surface : before activated carbon , after activated carbon and before cation exchager only.
why...