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Aquarium Supplies
Home » Saltwater Aquarium Supplies  » Filters  » Inline & Specialty Filters  » Phosphate Reactors  »  Kent Marine GFO and Carbon Phos Reactor
Kent Marine GFO and Carbon Phos Reactor

Kent Marine GFO and Carbon Phos Reactor

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Kent Marine GFO and Carbon Phos Reactor Information

The Kent Marine Phos Reactor is primarily intended to be used with phosphate-removal media such as Kent Power Phos and Phosphate Sponge, however it may be used with numerous filtration media to best suit the changing needs of the aquarium. Depending on the choice of media, the Phos Reactor may be used as a fluidized-bed filter, exposing the maximum amount of the media’s surface area to aquarium water, hence increasing filtration efficiency.

It may be employed as a hang-on-tank or in-sump filter, depending on your aquarium set up. The Phos Reactor can be used in many different applications and accepts Power Phos, Phosphate Sponge, Bio Bind, Reef Carbon, Nitrate Sponge, Organic Adsorption Resin, Copper Sponge, Mixed-Bed Resin.

The Phos Reactor is built from high-quality acrylic and ABS, and utilizes a special twist-lock head that eliminates the need for tedious thumb-screws. The intelligent design of the Phos Reactor makes set-up very simple; in contrast to competing filters, no additional elbows or other plumbing pieces are required for basic operation.


  • Dimensions (H x D): 14" x 4.5" (including hanging bracket)
  • Inlet / Outlet: 1/2"

What's in the Box

  • phos reactor
  • x2 sponge discs
  • o-ring
  • barbed elbow fitting
  • 1` of 1/2" flexible tubing
  • manual

Manufacturer Info

Kent Marine Aquarium Supplies
Kent Marine was established by aquatic hobbyists who saw a need for products that aid the user in creating the most natural enclosed marine and freshwater environment possible. From vitamin and mineral supplements to nutritional products and filter media, Kent Marine set the benchmark and was one of the first in the aquatic industry to provide these unique solutions. For the past 15 years, Kent Marine has been committed to providing effective ways to keep beautiful, healthy aquariums. Through continuous research, testing and development, new products like salt mix, scrapers and reverse osmosis filtration were brought into the Kent Marine family.


Manufacturer`s Warranty: 90 days

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Kent Marine GFO and Carbon Phos Reactor Reviews

Average Rating
(10 reviews)
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Lack of Important Part

Reviewers Rating Average

Posted: 3/15/2012 from CARNEGIE, PA UNITED STATES
3.0 5
Experience Level: Intermediate

Comments: I have begun to set up my Kent Phosphate Reactor and as I read the instructions and check the box I noticed an immprtant part not included. There is no ball valve included which is a very important part for the flow of media in the container. The instructions notes on paage two of the instructions line 9 that "the" ball valve should be sdjusted for correct flow of the media. Two Little Fishies includes the call valve in their product. You will find that it is not easy finding an inline 1/2" ball valve unless you have a pool supply store in your area. A hardware can make one up but the size is so large it is unslightly. Unless you are locating the container close to the pump unit needed the hose included is too short. I just hope it doesn't leak like I have read in other articles.

4 of 4 People found this review helpful, did you? Yes No


Reviewers Rating Excellent!

Posted: 4/18/2011 from COLUMBUS, IN UNITED STATES
5.0 5
Experience Level: Expert

Comments: Love these little reactors. I own 4 and plan on buying 4 more.I have ten 75 gallon frag tanks,I have GEO,VERTEX,and NEXTREEF reactor on all of them, but these little reactors from kent I move from tank to tank. Never had one leak, I had two, 150 two little fishies reactor both leaked around the connection fittings. I highly recommend the Kent for carbon or GFO. I use a maxijet 606 on them. Thanks Greg

2 of 2 People found this review helpful, did you? Yes No

Great Item

Reviewers Rating Excellent!

Posted: 10/16/2009 from SPARKS, NV UNITED STATES
5.0 5
Experience Level: Expert

Comments: I own an aquarium maintenance company and I currently have 8 of these running on various client tanks. I've never had one issue with them and the build quality is very satisfactory. Its solid acrylic and I have never had an issue. They require less modification then the two little fishes reactors which makes setup a breeze. I've only had one leak and that was after two years of use, and the gasket was worn. All I needed to do was replace the gasket and its been great ever since. considering its use, 2-3 years is probably all you will get out of one gasket. maybe 5 if your lucky... not bad. overall, great product. I've been using them for around 3 years now and have been very happy.

7 of 7 People found this review helpful, did you? Yes No

Don't Buy!

Reviewers Rating Unsatisfactory

Posted: 12/27/2008 from FORT MYERS, FL UNITED STATES
1.0 5
Experience Level: Intermediate

Comments: I have both this reactor and the two little fishies reactor...this one is junk! the construction is super cheap, it was like they cut the fittings with a hack saw, no ends were square. the o-ring was oversized for the groove and does not seat properly which may have lead to the lid coming undone which flooded my house. It had to be modified to ensure it would not come undone unexpectedly, again. for the money and the construction , buy the two little fishies one!

3 of 4 People found this review helpful, did you? Yes No

Very poor build quality

Reviewers Rating Unsatisfactory

Posted: 11/13/2008 from ADDISON, IL UNITED STATES
1.0 5
Experience Level: Intermediate

Comments: This thing is junk the elbow joints leak returned it got a second one and the same thing the elbow joints leaks. For the money I would expect this thing not to leak from the start.

3 of 6 People found this review helpful, did you? Yes No

Phos Reactor Review

Reviewers Rating Average

Posted: 4/4/2008 from BOTHELL, WA UNITED STATES
3.0 5
Experience Level: Intermediate

Comments: The build quality of this product is marginal (the first one a received leaked at one of the glue joints) but for the money it works well. I made new filter disks out of 50 micron filter material since those supplied are rather course. The design makes it hard to load (when material is wet from rinsing). The cost to manufacture this reactor is likely $4-$5. There is room in the market for a better product but for $40, this is the best out there. MD was very good about the return.

3 of 4 People found this review helpful, did you? Yes No


Reviewers Rating Average

Posted: 3/15/2008 from USA
3.0 5
Experience Level: Intermediate

Comments: One of the elbow joints leaks even though they are glued. Not a big deal but I will have to add some epoxy to keep it from leaking since I hang it external. I specifically bought this model because of the glued elbows that take the water back over the tank. I figured it would have less chance of a leak. So of course mine ends up leaking anyway.

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

Good unit...good price

Reviewers Rating Great

4.0 5

Comments: The Kent Marine Phos Reactor is well built and a solid unit. I would recommend it to anyone. The only thing I don't like is there should be finer sponge disks available.

5 of 9 People found this review helpful, did you? Yes No

Excellent Choice

Reviewers Rating Excellent!

5.0 5

Comments: Reasonably priced and works great!

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

Excellent Product

Reviewers Rating Excellent!

5.0 5

Comments: I've been using it with Rowaphos-works great to keep phosphate at undectable (with Salifert phosphate kit) levels. I prefer this design to that of the similar "two little fishies" product.

16 of 19 People found this review helpful, did you? Yes No

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