The Reef Octopus VarioS 10 Controllable Circulation Pump is the largest in the VarioS circulation line, built for high-volume return, reactor-feed, or closed-loop circulation on large reef systems. The same 5-speed DC control and ceramic shaft construction scale up to deliver the most flow in the lineup. Best for: return pump duty, reactor feed, or closed-loop circulation on large systems Included: float switch, power supply, input/output unions, stepped barb output fitting, protective intake screen Controls: 5-speed controller, feed/pause modes, 0-10V input for third-party controller integration Design: true slow-start ramp, waterproof 3-conductor union, rotatable output in 90-degree increments As the top of the VarioS circulation line, the 10 is the pick for large systems needing serious return flow with the same variable-speed refinement as the smaller models.Compatible replacement parts: ceramic shafts and impellers for the VarioS 10.