- Cobalt MJ1200 Powerhead
Why does BRS recommend this?
The Cobalt MJ line of pumps is great for auto top off systems, reactors, or low flow equipment. These pumps are made in Italy and are much quieter in operation than similar pumps that appear to be identical. With so many applications the Cobalt MJ pumps have some of the best value for a submersible pump.
- Flow Rate: 295 GPH
- Maximum Head Pressure: 69"
- Power Usage: 20 Watts
- 3 Year Warranty
- 3/4" Input
- 1/2" Output
- 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
Dimensions - 6" x 3" x 2"
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.
Quick Compare - Cobalt Aquatics MJ Powerheads
|Model||Flow Rate||Maximum Head Pressure||Watts|
|Cobalt MJ400||106 GPH||29"||5|
shocked By joesfiddy on 3/16/2019joesfiddy wouldn't recommend this product to a friendI just threw away 2 of these p[umps only a few years old they both shocked me when trying to be used.
Stray voltage By Jason on 8/26/2018Jason wouldn't recommend this product to a friendHave had this pump for over a year and went to stick my hand in tank and got shocked bad ! Took a couple tries to figure out this pump was the issue .
Good return pump By Edwinalexander on 7/3/2018Edwinalexander would recommend this product to a friendI’m using this pump as a return pump for my JBJ 20 RL. Working perfect and silent. Perfect fit.
Great powerhead By Robert on 6/22/2018Robert would recommend this product to a friendI have used this modle of powerhead for years i have 5 of them two of them i use for mixing salt and pumping ro seaveral others for media reactors i realy dont see why other people are having problems the one on my salt mixing tank has ben runing for 2 years non stop and never cleand
Does the job but... By Daniel on 4/24/2018Daniel wouldn't recommend this product to a friendThis is a strong little pump MJ1200, but it's a little loud. I have this in my sump as a reactor pump and if the line happens to touch the walls or lid of the sump the vibration is even louder. I think I might replace this pump in the near future and just use it for my water changes.
Don't waste you're money By Charles on 12/11/2017Charles wouldn't recommend this product to a friendDo not buy if looking for it to be quite do not buy if you need the flow it says it has cause it does not make that much flow and lastly it will not last more then a few weeks at best honestly I don't know why brs is still carryingthis pump they use to be great but since Cobalt took them over they went down hill fast
Stopped working By Skivel2 on 11/15/2017Skivel2 wouldn't recommend this product to a friendWorked great for about 2 months. Now has very little pressure but clean as a whistle.
did not last 2 months By Keith on 10/27/2017Keith wouldn't recommend this product to a friendSeemed to be working great for 2 months on my GFO/Carbon reactor. Then, just stopped working one morning. Cleaned / soaked in vinegar (even though wasn't too dirty), but no luck. It spins for a few seconds then dies. Not a good quality product.
Don't buy if you need good flow By Charles on 5/30/2017Charles wouldn't recommend this product to a friendHas little to no flow with zero head pressure I wouldn't recommend for price it should be much better I've had cheap Chinese pumps better then this also should a barbed fitting to connect multiple sizes of hoses to it if I was brs I would not have chosen this as a brs recommends product and fills very cheap
Just was not for me! By CLAUDIUS on 5/1/2017CLAUDIUS wouldn't recommend this product to a friendPurchased two MJ1200. Both stop working exactly 1 day after my warranty.
I have 2 other powerheads that I've had for years and was much cheaper.
May work for someone else!
SHOCKING EXPERIENCE By Sparky on 1/28/2017Sparky wouldn't recommend this product to a friendI was cleaning this pump and plugged it in to run fresh water through it. The pump shocked me pretty good so I got a voltage tester and threw one probe in the bucket with the pump running and the other to ground. 48 volts was surging through the water.. The pump was only about 5 months old and I wonder how long it was energizing my reef tank. I did want to share this experience since the MJ's highly touted as being good. I have replaced this one with a Eheim 1048 that I've had for 15 years that was in my boneyard of retired equipment. Now that is a good pump!!
Awesome By Mark on 1/16/2017Mark would recommend this product to a friendI bought a used biocube 29 that someone had already done a mess of "retrofit" diy wtf... Luckily this return pump was the best and only part I kept. Mine is an older model, but it is still pumping away like a champ one year in, plus however long previous owner had it. Made me brand loyal!
In using this with your mini reactor, is the pump large enough to push the water from the display down 35 inches, (inside the stand) then back up the 35 inches back to the tank? Or should I be looking at something larger? The tank is only 45 gallons and is an all in one, hence why I want to put it in the stand, (back siphoning an issue I am aware of).
In this pump it has a maximum head height of 69" meaning the flow after pushing the water back up 35" will be greatly reduced. We would recommend a larger pump if possible such as a Sicce 1.5. I have included a link to the pump as well as the adapter to connect the pump to the reactor tubing.
1⁄2" Male NPT x 1⁄2" Push Connect
Syncra Silent 1.5 Pump (357 GPH) - Sicce
What all do I need to connect this pump to the BRS Dual Reactor for gfo and Carbon besides the 1/2" tubing?
Can this be used as an external pump if you plumb the input?
This could be used externally however plumbing it would prove to be a challenge as it does not use barb or threaded fittings and would need 1/2" ID tubing to connect to it. Keep in mind this cannot pull water, only push, so when plumbing the water will need to naturally feed into the pump. Feel free to let us know if you have any further questions!
Im looking at this pump to replace my Rio on the CPR bakpak skimmer, does this come with everything need it make it work. Im gonna be honest I'm not the best at mods. Thank you.
This pump will come with a standard impeller and will not work as a skimmer pump unfortunately. If you have a replacement impeller which can work in a MJ1200 this may work? Feel free to let us know if you have any further questions!
As I need to ensure that space is available within my existing sump, what are the "footprint" dimensions of the MJ-1200 pump?
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.
What is the output size on this pump?
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.
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.
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.