Made in Italy for superior performance as powerhead or pump
Built to perform reliably even under the harshest aquarium conditions
Use as powerhead, wavemaker, or as protein skimmer calcium reactor or refugium pump
The ORIGINAL workhorse built to perform AND last! Cobalt International MJ multiuse submersible pump and powerhead brings back the superior Italian-made performance you've trusted and relied on in the past. Energy efficiency, versatile internal or external use in freshwater or saltwater marine aquariums PLUS easy-to-reconfigure design makes this multitasking pump great for tackling all your aquarium needs - even under the harshest aquarium conditions!
Please click on "More Information" for installation, maintenance and troubleshooting guide.
Install the Venturi device and Flow Deflector. Position the pump with its Conical Adapter on the lift tube of your undergravel filter. The powerhead must be at least partially submerged but may also be used fully submerged. Normally the specially designed Lift Tube Adapter will keep your powerhead in the position you have chosen. If additional stability is necessary, utilize the Suction Cups or Mounting Hook.
To use a Suction Cup, press it into the Mounting Bracket and slide the Bracket into one of the three Mounting Grooves on the pump body. Press Suction Cup to side of aquarium on a smooth, clean surface.
To use the Mounting Hook, slide it through Mounting Bracket. Press a Suction Cup into base of Mounting Hook and then mount on pump by sliding Mounting Bracket into one of the three Mounting Grooves on the pump body. Position pump in aquarium by snapping hook end over the top frame and pressing Suction Cup to glass to secure firmly. Adjust position of the pump, up or down, by sliding Mounting Bracket along the Hook. A small clamp is supplied to guide power cord and airline tubing. Press the clamp on top of the clamp as desired. Note: Suction Cups and Mounting Hook can be used separately or together.
Use of Aeration Feature
To improve aeration and gas exchange, the Venturi Aeration Feature may be utilized together with the airline tubing and air filter supplied with your pump. Two small red Air Tubing Adapters are supplied for any size of tubing. The Air Filter also functions as a valve. When using the Venturi air-mixing feature, air volume can be adjusted by turning the top part of the Air Filter. Note: Aeration decreases if water volume is low or if pump is positioned too far below the water surface. Water volume decreases when the Venturi feature is used.
For optimum performance, it is best to periodically clean the internal moving parts with warm water. If the Rotor becomes encrusted with lime scale, use vinegar or lemon juice to remove buildup. Do not use solvents.
When using your MJ pump with calcium reactors it imperative to perform monthly maintenance to remove buildup of calcium residue inside your MJ pump.
Unplug and remove the MJ pump from the water
Remove the impeller
Pour vinegar into the impeller housing well inside the motor
Soak the impeller housing and impeller overnight
Brush the impeller and impeller well with a toothbrush removing deposits
If the impeller is not turning. . .
Unplug and remove the MJ pump from water
Remove the impeller
Plug the MJ pump in
Run the impeller around the outside of the casing. If you feel magnetic motion then your MJ pump is good (99% of the time it's fine).
If it has no motion then, please contact the manufacturer for replacement (motor is dead).
Please Note: If the impeller does have motion then the MJ pump is fine but may need an impeller replacement.
A crucial - and often overlooked - aspect of keeping a reef aquarium is water movement. Proper water movement goes a long way toward helping a reef system thrive. Corals and other reef inhabitants are accustomed to rapid, constant water movement.
Please note: Return of electrical equipment to Drs. Foster & Smith for exchange or refund is limited to 60 days from the date of purchase. Beyond 60 days, please contact the manufacturer for repair or replacement as covered by the manufacturer's warranty.
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