Click to Verify - This site chose VeriSign SSL for secure e-commerce and confidential communications.
Security Seal
Marine Depot Live Chat Support
Pet supplies, Pet products, and Pet Accessories for your dogs, cats, birds, fish, reptiles or small pets. Pet experts are available to help you.
New Customer? Register | Sign In
Expires in 00:00:00
15% Off Additives
0 items
Your cart is currently empty.
View Cart Checkout
Aquarium Supplies
Home » Saltwater Aquarium Supplies  » Filters  » Inline & Specialty Filters  » Chemical Reactors  »  Marine Depot Media Reactor for GFO and Carbon w/ Cobalt Aquatics MJ1200 Pump
Marine Depot Media Reactor for GFO and Carbon w/ Cobalt Aquatics MJ1200 Pump

Marine Depot Media Reactor for GFO and Carbon w/ Cobalt Aquatics MJ1200 Pump

Item #:
Please make a selection
$86.99 to $124.99
Marine Depot 60-day Returns
At Marine Depot, we stand behind our products. That is why we offer a 60-day return period: one of the best in the industry! Learn More

Marine Depot Media Reactor for GFO and Carbon w/ Cobalt Aquatics MJ1200 Pump Information

Marine Depot Single Media Reactor for GFO or Carbon

Finally, an easy-to-use media reactor that is both economical and durable!

Great for use with GFO (granular ferrous oxide), activated carbon, biological media or most types of aquarium filter media.

  • Heavy-duty, durable construction
  • Clear housing for easy visual inspection
  • High-capacity cartridge
  • Quick disconnect fittings for easy servicing
  • Ball valve for precise flow adjustment
  • Fitting allows for quick-disconnect with any Cobalt MJ powerhead
  • Wall bracket for installation inside aquarium stand
  • Filter wrench included
*Filter media sold separately
**Not designed for BioPellets

Cobalt MJ1200 Powerhead/Pump Information

The Original MJ multi-use submersible pump and power head is built to perform and last under the harshest conditions. Ideal 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 6ft power cord
  • Adjustable venturi with silencer
  • Triple suction cup mount
  • Large intake screen for use with sponge
  • Max Flow: 295GPH
  • Max Height: 69"
  • Power Consumption: 20W

Manufacturer Info carries more than 7,500 popular and hard-to-find aquarium supplies and fish tank accessories for saltwater and freshwater aquariums. You’ll find the top aquarium equipment and aquarium accessories from Hagen, Red Sea, Eheim, Coralife and many more. All of our aquarium pet supplies carry a 60-day money-back guarantee and we offer a Low Price Guarantee on all in-stock aquarium products. We ship 99.9% of fish tank supplies the same business day if you place your order before 6 PM EST. If you have any questions about fish supplies please do not hesitate to contact us. We’re here to help!

Marine Depot Media Reactor for GFO and Carbon w/ Cobalt Aquatics MJ1200 Pump Reviews

Average Rating
(3 reviews)
Sort Reviews By:


Reviewers Rating Unsatisfactory

Posted: 10/31/2013 from SUFFOLK, VA UNITED STATES
0.5 5
Experience Level: Intermediate

Comments: This filter clogs very easily. In my opinion the pump that comes with it does not have enough pressure. The instructions could be better and you may have to buy extra hose. I'm returning the one I bought.

0 of 1 People found this review helpful, did you? Yes No

Dual reactor

Reviewers Rating Great

Posted: 7/14/2013 from KENNEWICK, WA UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: Product was well packed and upon inspection seems really well made. At first start up there were 0 leaks a little tricky getting the flow valve set correctly but once I got that all seems to be ok. Running seachem carbon in the first and seachem phosgaurd in the sencond. Its only been running for 2 days so time will tell.

Did you find this review helpful? Yes No

Marine depot GFO media reactor

Reviewers Rating Unsatisfactory

Posted: 6/24/2013 from DIAMOND BAR, CA UNITED STATES
0.5 5
Experience Level: Intermediate

Comments: This reactor did not meet my expectations. The biggest issue was the GFO media was so light that their was no weight to keep the pads in place so the pads lift and mix with the media. If you put to much media in the chamber their is no flow to keep the media moving so everything settles to the bottom. I'm now using another reactor and all is well.

Did you find this review helpful? Yes No

Accessories for Marine Depot Media Reactor for GFO and Carbon w/ Cobalt Aquatics MJ1200 Pump

Marine Depot Media Reactor for GFO and Carbon w/ Cobalt Aquatics MJ1200 Pump Window Navigation Prev Next Zoom Close
We value your opinion & experience
Thank you for taking the time to review our products!

This is a Product Review for: Marine Depot Media Reactor for GFO and Carbon w/ Cobalt Aquatics MJ1200 Pump

First tell us about yourself.

Name to display on the review: Location (ex: Anaheim, CA):
Your experience level:

How would you rate this product?

Review Title:

Write your review:
(Please focus on product quality and performance, maximum 2000 characters)

This item is temporarily unavailable but will be back in stock soon.

Item #
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.

Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

Your Email:
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Your Email:
If you find a product we sell for a lower price at another online store, we will match their price—today and up to 14 days after you’ve purchased the item!

Enter the price, shipping cost and website address where you found the lower price. Then click the "Add to Cart" button. We will review the lower price while processing your order and make any necessary reductions before your order ships. Some restrictions apply. See Terms & Conditions.

Sorry! While there is no limit to the number of items we'll price match in an order, our online system will only accept one. Please call us at 1-800-566-FISH (3474) and we’ll happily price match additional items for you.

Price *
Shipping Cost *
Competitor's Website *

Sharing products with friends and family couldn’t be easier!

Just complete the fields below to send your friend or family member a personalized email message featuring the product of your choice.

Your Name *

Friend's Name *

Friend's Email *

Personal Message

Please make a selection 
Add to Wish List
Select Wish List:
Comments (up to 200 characters):
Quantity Desired:
Quantity Received:
Email Specials
Subscribe to our newsletter feed.
Newsletter Tips & Tricks! New Products!
Discounts & Promos!
July 7, 2014
"I have been a customer of Marine Depot since they opened. Always get what I ordered packed properly and shipped quickly."

July 6, 2014
"I was very satisfied with how everything was packaged. Everything I ordered was nicely placed in the box. I will definitely order from here again. Thank you Marine Depot."

July 2, 2014
"Love Marine Depot. All around great company with great service and they have everything you can think of."