The REEFER DC Skimmers include self-leveling technology that prevents over-skimming and full cups from spilling while continuing to aerate the water. Self-Leveling. The Self-leveling feature is activated whenever the wetness of the foam in the neck exceeds the user-adjusted “over-skim” threshold. The intensity of the pump is immediately reduced to prevent the over-skim and then gradually increased or decreased, a bit at a time, according to the foam wetness, until the preset pump intensity is reached and stable skimming is restored. REEFER DC Skimmer features: Patent-pending Self-leveling technology to prevent over-skimming and to prevent the cup from spilling over once it’s full while continuing to aerate the water A customised daily schedule of active and inactive skimming periods Quiet operation Energy-efficient with lower running costs The new REEFER DC Skimmer is run via the ReefRun Dual Controller (sold separately) as it operates the ReefRun DC Pump at the same time. ReefBeat App Quick-actions Create your unique Feed scenario by switching selected pumps off or run at different intensities at different times for different durations. Select the order and timing between switching devices back on after a maintenance shutdown, such as allowing a few minutes for your return pump to restore water levels in sump and aquarium before switching on the skimmer, wave pumps and dosers. REEFER DC Skimmer Spec 300 600 900 Height 53cm 56cm 59cm Pump Sicce PSK DC-1200 Sicce PSK DC-1200 Sicce PSK DC-1200 Air Flow 500 l/h 750 l/h 900 l/h Water Flow 1000 l/h 1500 l/h 2000 l/h Power Consumption 20W 25W 30W