GreenPlanet Nutrients Root Builder Size:1L precise and independent controlsThe PX2 precise and independent controlsThe PX2 provides independent control of the following features in each of its dual zones: Photoperiod timing to control light and dark cyclesPhotosynthetic photon flux control to precisely schedule the PPF being emitted from fixtures during the light cycle (wattage or percentage)Auto dimming when temperature exceeds set pointsEmergency auto shutdown of lights upon user defined over temperature eventsConfigurable restrike delay times to eliminate lamp damaging hot startsSunrise sunset simulation settings to provide a gradual ramp up and down at both ends of your photoperiodBuilt in battery backup Voltage: 100–240V 50 60Hz 0 Overview: For use in freshwater and marine aquariums Apply at a rate of 1 Root Builder is a broad spectrum of beneficial micro organisms which promote plant nutrient uptake