Quick answer: The Sicce PSK SDC 4000 Controllable Skimmer Pump is a DC, app-controllable replacement/upgrade pump built specifically for protein skimmers. It has a variable flow range of roughly 396–1057 GPH (1,500–4,000 L/h), runs wet or dry (submersible or inline), and pairs with Sicce's free ContrALL smartphone app for flow tuning, feed-pause scheduling, and real-time alerts on blocked rotor, dry-running, or signal loss.
What This Pump Actually Is (and Isn't)
The PSK SDC 4000 is not a standalone protein skimmer — it's the pump that drives one. It's designed as a direct swap-in upgrade for skimmers already built around Sicce's PSK pump housing (a design used across a wide range of OEM and aftermarket skimmer bodies), and it's also supplied directly to skimmer manufacturers for factory installation. If you're replacing a failed or aging pump on an existing skimmer, or upgrading a fixed-speed pump to a controllable one, this is the part built for that job. Before ordering, it's worth confirming your skimmer's pump housing matches the PSK/PSK SDC mounting pattern — our team can help verify fit if you're not sure.
Specifications
| Spec | Detail |
|---|---|
| Model | Sicce PSK SDC 4000 |
| Flow Range (Q-Max) | 1,500–4,000 L/h (≈396–1,057 GPH) |
| Power Draw | 20–55W |
| Voltage | 24V DC (AC/DC transformer included) |
| Application | Wet & Dry — submersible or inline |
| Impeller | Needle wheel impeller, ceramic shaft |
| Control | Included physical controller + free ContrALL WiFi app (no separate receiver needed) |
| Monitoring | Integrated water temperature sensor |
| Alerts | Blocked rotor, dry running, loss of signal |
| Extra Modes | Programmable Pause/Feed mode (10-minute timed shutoff), 5 customizable presets |
| Protection | Thermal overheat protection |
Why Controllable Flow Matters on a Skimmer Pump
A fixed-speed skimmer pump forces a compromise: run it hard enough to process a heavily-stocked tank and you risk wet, overflowing skimmate during feeding or dosing swings; run it soft enough to avoid that and you leave capacity on the table during a bioload spike. The PSK SDC 4000's variable flow range lets you dial in air-to-water mix and contact time for your specific bioload, then adjust seasonally or as the tank matures — without swapping pumps or adding a separate speed controller.
The built-in Pause/Feed mode is a smaller detail that solves a real, everyday annoyance: rather than manually shutting off the skimmer before feeding or dosing (and remembering to turn it back on), you can trigger a programmed 10-minute pause from the app or controller and let it resume automatically.
Wet vs. Dry Application
The PSK SDC 4000 is rated for both wet (submersible, mounted inside the skimmer body below the waterline) and dry (inline, plumbed outside the skimmer with hard tubing) installation. Most in-sump cone and cylindrical skimmers use the wet configuration; larger commercial or custom systems more often run the pump inline in a dry chamber for easier service access. Either way, the ceramic shaft and needle wheel impeller are the same — only the mounting and plumbing change.
App Control & Multi-Pump Sync
The free ContrALL app connects over WiFi with no separate receiver hardware required, and it's where most of this pump's flexibility lives:
- Direct flow control from your phone, with five presets you can fully customize to your own flow targets.
- Real-time alerts if the rotor blocks, the pump runs dry, or it loses signal — useful for catching a problem before it becomes a tank emergency.
- Multi-pump synchronization, which lets you link and coordinate settings across more than one Sicce SDC pump. For a single display tank this is a nice-to-have; for a multi-tank commercial system (fish store holding systems, coral propagation racks, or a service account managing several skimmers), it means one technician can check and adjust every skimmer pump on the account from a single app instead of visiting each tank individually.
Installation Notes
- Confirm your skimmer body accepts a PSK/PSK SDC-pattern pump before ordering, especially if this is a replacement rather than a new skimmer purchase.
- Mount wet (submerged in the skimmer's pump chamber) or dry (inline, plumbed externally), per your skimmer's design.
- Connect the included 24V transformer to a GFCI-protected outlet.
- Pair the pump with the ContrALL app over WiFi, or use the included physical controller if you'd rather not rely on a phone connection.
- Set your target flow rate within the 396–1,057 GPH range based on your skimmer manufacturer's recommendation and your tank's bioload.
Residential and Commercial Fit
For a home reef tank, this pump is most often chosen when a stock skimmer pump has failed, when a hobbyist wants finer control over wet/dry skimmate than a fixed-speed pump allows, or when upgrading an older skimmer to app-based monitoring. For commercial applications — retail holding systems, coral farms, and multi-tank maintenance accounts — the synchronized multi-pump control and real-time fault alerts reduce the number of physical site visits needed to keep several skimmers running correctly.
Frequently Asked Questions
Is the Sicce PSK SDC 4000 a full protein skimmer?
No. It's the pump component only, designed to replace or upgrade the pump on a compatible existing skimmer body. It does not include a skimmer cup, body, or reaction chamber.
What's the actual flow range in gallons per hour?
Approximately 396 to 1,057 GPH, corresponding to the pump's rated 1,500–4,000 liters/hour output.
Can it run submerged inside my skimmer, or does it have to be plumbed inline?
Both. It's rated for wet (submersible) and dry (inline) use, so it fits either mounting style depending on your skimmer's design.
Do I need a separate WiFi receiver to use the app?
No. WiFi connectivity is built into the pump, and the free ContrALL app connects directly without additional hardware.
Can I control more than one of these pumps from the same app?
Yes. The ContrALL app supports synchronizing and customizing settings across multiple connected Sicce SDC pumps, which is useful for multi-tank systems.
Ready to Upgrade Your Skimmer's Pump?
The Sicce PSK SDC 4000 Controllable Skimmer Pump is available now at Marine Concept Supply. If you're not sure whether it fits your current skimmer, reach out and our team can help confirm compatibility before you order — for a home reef, a commercial holding system, or anything in between. Visit our Wheeling, IL showroom, browse our full lineup of protein skimmers, or contact us for help with sizing and install.
