I like to add that solids washout may lead to the same result, check decanted water S.S, but the case you have is most probably having TEL leaked to the system, if so , it will kill all your bugs. microscopic examination will help.

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I like to add that solids washout may lead to the same result, check decanted water S.S, but the case you have is most probably having TEL leaked to the system, if so , it will kill all your bugs. microscopic examination will help.