The RW Series of propeller pumps succeed the very popular WP line. The RW pump has a different look to widen the flow and also make them quieter than the already silent WP’s. The controller has some significant changes. Multiple pumps can now be controlled together in a master/slave format from a single controller. The controller will communicate with the designated slave pumps wirelessly, and can handle up to 8 slave pumps. Each slave pump’s output can be adjusted individually, while the master pump controls the wave function. There is also a ‘Feed’ button and a light sensor to reduce flow at night. The new RW series has 8 different selectable flow rates down to 10%, while the older WP only had 3 choices(100%/75%/50%).