From the tunze 9010 skimmer manual, I copied the following text.
"For operation in surroundings which tolerate a
very low noise level only (living room, bedrooms,
et cetera), the Comline DOC skimmer can be
connected up to a time switch (7). The unit may be
put out of action for eight hours a day, for example.
The missed protein skimming action is caught up
almost after the unit has been switched on again.
The Comline DOC skimmer has the advantageous
property of not changing its setting when switched
off. In this mode of operation, the skimmer should
not be run at the lower limit of the recommended
output for the aquarium."
Might just be propaganda, but it seems to say if you shut the skimmer off for a while (8hrs) then whatever skimming was missed, will be caught up.
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