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 shut off for eight hours / a day, for example. The missed protein skimming action is caught up almost completely within a few hours 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. Du menar de här raderna? Hälsningar Kjelle