ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 547

6. Monitor the pH throughout the start-up process. An observed decline in pH is an
indication that the nitrifying bacteria are beginning to remove ammonia. It is important,
however, that the pH does not drop too low, as this can cause biological activity to be
inhibited, which can then result in severe membrane fouling. During start-up it is
beneficial to operate at a pH between 7.0 and 7.5 to ensure optimal performance and
growth of bacteria.
The pH should be maintained between 6.5 and 8.0 during normal operation.
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