Carbon Treatment should be done according to your vendor recommendations.
Things to be aware of are:
Amount of organic leaching from dry film in pattern plating.  If excessive
increase frequency of treatment.
Method of addition or replenisment of the additives.  In a single component
additive system the rate of consumption of the different components may not
be directly proportional to the addition and C-Treatment takes you back to
baseline before things get too far out of wack.
Some additive systems are designed to minimize the need for C-treatment
especially ones where the different componenets are supplied and controlled
seperately.  The frequency may be as long as once a year.

George Milad
Electrolytic Products Manger
Atotech USA Inc

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