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Cobalt MJ1200 Powerhead

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Cobalt MJ1200 Powerhead

88% Recommend this to a friend (28 of 32)

SKU: 210504
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Quick Overview

Quality, Italian-made submersible powerhead from a company you can trust. Most commonly used for low flow like feed equipment such as a carbon reactor.

  • Flow Rate: 295 GPH

  • Maximum Head Pressure: 69"

  • Power Usage: 20 Watts

  • 3 Year Warranty


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Previously Asked Questions

  • by David on April 5, 2014, @4:52 PM

    If you're using this pump as part of your ATO system, what is the size of the output? I'm getting the Hydor ATO system and this pump was recommended by you. I would like to get the correct size tubing before I get the pump and set up the system. Thanks.

    Bulk Reef Supply Hi David,
    The MJ1200 has an output that is actually the same size as 1/2" RO tubing, so conveniently you can actually use a 1/2" push connect union on the end to connect the pump to 1/2" ro tubing just like we do with our BRS reactors.


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  • by Jacob on March 22, 2014, @5:29 AM

    What is the output size on this pump?

    Bulk Reef Supply Hi Jacob,
    The output size of the pump is the same as 1/2" polyethylene tubing like those used with our reactors (which is a slightly different standard then 1/2" PVC). A 1/2" push connect union for example will snap right on.

    Do you find this question helpful?  Yes   No

  • by Patrick S. on April 14, 2014, @12:21 AM

    As I need to ensure that space is available within my existing sump, what are the "footprint" dimensions of the MJ-1200 pump?

    Bulk Reef Supply Hey Patrick,
    Assuming the output is up and your not using any of the suction cups, brackets, etc the pump is about 2" wide and 3.5" across, though keep in mind with that later number you will want some extra room so the water can actually enter the volute so I would go with more like 2x4 at the least.

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Full Details

The Cobalt Aquatics MJ series of pumps is the same Italian-made MJ you have been using for the last 20 years. Reliability and low operating noise have been the staple of this pump series, a principle reason why aquarists around the world have been using them for decades. After the original MJ distributor moved operations to China, Cobalt Aquatics jumped on the opportunity to work with the Italian manufacturer to continue to provide a source for this high quality product line. Mostly used for wave makers, protein skimmers, calcium reactors, nano aquariums, under gravel filters and hydroponic applications.


  • Fully rotational output
  • Fully sealed intake for internal and external use
  • Universal intake tube Adjustable hanger with cord guide and 6 Ft power cord
  • Adjustable venturi with silencer
  • Triple suction cup mount
  • Large intake screen for use with sponge

Quick Compare - Cobalt Aquatics MJ Powerheads

Model Flow Rate Maximum Head Pressure Watts
Cobalt MJ400 106 GPH 29" 5

Cobalt MJ600

160 GPH



Cobalt MJ900

230 GPH



Cobalt MJ1200

295 GPH





Items 1 to 12 of 32 total

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  • Great pump By CB on 2/5/2015

    Using as a return pump on my 29g Biocube. Very quite can't hear it over MP-10 or skimmer.
  • Good small pump By Mondo on 2/4/2015

    I use it for my gfo carbon reactor. And to do water changed when I pump new water back into tank. Works well.
  • better than the Marineland MJ1200 By Ken on 1/25/2015

    I have noticed the quality of the Marineland pumps has been going down. I use them for mixing and pumping my new water. (1/2 inch ID hose fits perfectly). I took a chance and ordered the Cobalt and am happy i did. They are quieter and seem better built so far.
  • Quality and Performance By Craig on 1/16/2015

    I purchased this power head to power my BRS dual reactor. When I purchased it I though well if it's not strong enough to drive the dual reactor I'll use it for dipping coral. Well need less to say its to powerful for that. It drive the dual with no problems, and ad a matter of fact I had to dial it back quite a bit to get the flow correct for the GFO
  • So quiet By Josh on 12/15/2014

    it is soooo quiet
  • Love these pumps. By Despairodyne on 11/26/2014

    I have about 6 of these atm and use them for transferring salt water and ro/di water from containers to tanks and to stir my salt making bucket.

    If the Sicce pump I bought for my Nuvo 16 isn't quiet enough, I'm going to split the returns and use the smaller Cobalt MJ's.

    Well worth the price.
  • beware leaking voltage By jonathan on 9/27/2014

    i had this pump running for 7 months feeding a reactor on my 75g, when i started having coral die. i tested and found it was leaking 110v into my tank!!!

    i lost a bunch of sps and ricordia thanks to this pump...

    use at your own risk....

    i bought a dc pump to feed my return, reactor, and skimmer. months later i once again have sps and ricordia thriving. this pump cost me a bunch of beautiful coral and money.
  • Super quiet! By perry on 7/22/2014

    the pump is one of the quiet things i have running on my system. I use it to run water throughout my UV sterilizer and it returns the water to the tank with no problem.
  • Really quiet, really powerful By Adam on 6/4/2014

    I've only had the MJ1200 for a couple of days, but so far I'm really impressed. I see more in my future.
  • Great power head, good pump By Devon on 5/19/2014

    I got this MJ1200 to use with the BRS canister reactor with carbon. It works very well and is the quietest pump I own.

    I also tried using it as a sump return because I wanted to reduce the return pump noise, but the flow rate drops to 50% with only 2 foot head pressure.

    I may end up using two as returns because they would still be quieter than one mag drive 3.
  • Good pump By Benjamin on 4/10/2014

    I recently replaced the two other mj1200's with these a few weeks back and the difference is ridiculous! These guys are completely silent!
  • Just quit By Bryan on 3/7/2014

    This unit was purchased with a BRS Reactor. After three months the pump just quit.

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