Hydor Koralia Wavemaker Photocell Automatic Night Mode: In this mode the pumps can be slowed down during the night and turned back to the set speed during the day. Night Mode: Indicated by a red LED, can come on automatically...
The ring controls shape and size of the fan-shaped flat stream outlet on the Pulser and the Rotating/Pulser. Three selectable options:
4 discreet holes in a fan shape
A narrow slot
A wide slot