MIL-HDBK-1003/6
h) A water softener sized to take care of make-up requirements for
operating conditions is recommended.
i) The permanent water softener may need to be supplemented for
initial fill requirements when water conditions are particularly poor.
j) Zero hardness (5 parts per million or less) and a PH of 9.3 to
9.9 with no free oxygen should be maintained in the system at all times.
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