Return lines, reactor feeds, and closed-loop circulation all need a DC propeller pump you can dial in precisely rather than a fixed-output pump that's either too strong or too weak. The Reef Octopus VarioS Controllable Circulation Pump line spans five sizes, from entry-level to high-output.
Why Controllable Circulation Matters
A fixed-speed pump forces a compromise — sized for peak demand, it's often overpowered most of the time; sized for average use, it can't keep up when you need more flow. A DC propeller pump with adjustable speed lets you match output to the actual job, whether that's a gentle reactor feed or a high-volume return.
Choosing a Size
- VarioS 2 — the entry point, built for return, reactor feed, or closed-loop circulation on smaller systems.
- VarioS 4 — steps up flow capacity for larger return, reactor-feed, or closed-loop circulation needs.
- VarioS 6 — a higher-output pump for larger circulation demands.
- VarioS 8 — high-output DC circulation for large return, reactor-feed, or closed-loop systems.
- VarioS 10 — the largest in the circulation line, built for high-volume return, reactor-feed, or closed-loop duty.
Setup Tips
- Size for your actual head height, not just rated max flow — output drops as vertical lift increases.
- Start at a moderate speed and adjust based on observed flow rather than running at max by default.
- Works in freshwater and saltwater alike, suiting planted tanks as well as reef systems.
The Reef Octopus VarioS Controllable Circulation Pump line is available at Marine Concept Supply across all sizes — order online or pick up at our shop in Wheeling, IL. Shop VarioS 2, VarioS 4, VarioS 6, VarioS 8, or VarioS 10, and browse more aquarium pumps.
