Nejdå, Det är för att sänkningarna av NP inte ska gå för fort och skada koraller under uppstarten. saxat ifrån KZ guiden "You should connect the ZEOvit® filter pump to an automatic timer if you have a high nutrient load or during the starting phase of the system. The pump should be switched on and off at an interval of 3 hours (3 hours on, 3 hours off, 3 hours on, 3 hours off, etc.) leading to an alternating environment of aerobic and anaerobic conditions. Every switch leads to an increased aspiration of PO4 by the microorganisms/bacteria residing in the material."