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BRS Bulk GFO Granular Ferric Oxide

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Granular Ferric Oxide (GFO) removes phosphate from the aquarium and is one of the most commonly used filtration medias used in the aquarium industry.  GFO is one of the few ways to easily maintain ultra low phosphate on a consistent basis. Maintaining these ultra low levels will help prevent algae outbreaks as well as treat existing algae issues. Your aquariums glass will also stay clear and free of the green hue significantly longer. GFO is most commonly used in a media reactor like the BRS reactor or media bag.


Phosphate inhibits proper coral growth by incorporating itself into the corals skeletal structure which makes it difficult for the coral to grow by laying down additional calcium and carbonate (alkalinity) ions. Maintaining ultra low phosphate levels will increase the growth of any SPS or LPS coral.


Algae outbreaks are one of the most common reasons for a complete tank shut down. We recommend preventing them by maintaining an ultra-low nutrient level environment where it would be difficult for them to get out of control to begin with. It is much easier to prevent outbreaks than it is to treat existing outbreaks.

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  • Quick Overview

Granular Ferric Oxide (GFO) removes phosphate from the aquarium and is one of the most commonly used filtration medias used in the aquarium industry.  GFO is one of the few ways to easily maintain ultra low phosphate on a consistent basis. Maintaining these ultra low levels will help prevent algae outbreaks as well as treat existing algae issues. Your aquariums glass will also stay clear and free of the green hue significantly longer. GFO is most commonly used in a media reactor like the BRS reactor or media bag.

Phosphate inhibits proper coral growth by incorporating itself into the corals skeletal structure which makes it difficult for the coral to grow by laying down additional calcium and carbonate (alkalinity) ions. Maintaining ultra low phosphate levels will increase the growth of any SPS or LPS coral.

Algae outbreaks are one of the most common reasons for a complete tank shut down. We recommend preventing them by maintaining an ultra-low nutrient level environment where it would be difficult for them to get out of control to begin with. It is much easier to prevent outbreaks than it is to treat existing outbreaks.More

BRS Bulk GFO Granular Ferric Oxide

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Previously Asked Questions

  • by Jeff on January 2, 2014, @4:49 PM

    How many cups in a pound of the BRS GFO?

    Bulk Reef Supply Hi Jeff,
    There is 4 cups in our 1lb container, 8 cups in the half gallon/2lb container and 16 cups in a gallon/4lb container.

    Do you find this question helpful?  Yes   No

  • by James on November 19, 2013, @7:22 AM

    Hi,

    I want to mix GFO with carbon in the BRS single reactor. Is it OK to use the cheaper GFO to mix in with the carbon or do you need the high capacity GFO? I have a small system so I use low quantities of both carbon and GFO in my reactor. I was just worried about the regular GFO being too small.

    Thanks,

    James

    Bulk Reef Supply Hey James,
    It doesn't cause any issues with the reactor to use standard GFO. Really the choice just comes down to the volume of space you have to work with. If you have a large tank you may need more regular GFO then will physically fit in the reactor. Then you either need to get a larger reactor, or use the HC GFO which only requires half the amount.

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  • by Paul on November 27, 2013, @10:19 AM

    Sorry I didn't see the instructions, can you tell me how much I will neeed to use in your BRS reactor and how long between changeouts? I have a 90 gal tank and soon to be 125
    thanks

    Bulk Reef Supply Hey Paul,
    The easiest way to know is to use the reef calculator at the link below. You just enter the size of your tank and it will tell you how much to run. In the case of your 90g thats about 1.4 cups (22 tablespoons). How long it lasts depends on how much phosphates you add to the tank (which is largely a matter of how much you feed). Pretty typical is 4-6 weeks though.

    Do you find this question helpful?  Yes   No

  • by Jason on May 13, 2014, @4:15 PM

    Does BRS GFO Granular lower alkalinity?

    Bulk Reef Supply Hi Jason,
    It wouldn't be likely to see any negative effect on your calcium or alkalinity. Its worth noting though, phosphate prevents precipitation (for example the formation of coral skeletons), so by removing phosphates your corals can grow easier which would mean they consume more calcium and alkalinity.

    Do you find this question helpful?  Yes   No

  • by John Lasky on March 1, 2014, @11:28 AM

    starting a 90 gallon . will also buy your reactor , how much product do I need to start out to fill the reactor. Thank John

    Bulk Reef Supply Hi John,
    The amount of media depends on the size of your tank with the maximum capacity of the reactor being 2 cups of media, though fortunately with your size tank you wouldn't be in excess of that. For a 90g tank you would use 1.5 cups of media. The easiest way to get measurements for most of these products is to use the BRS Calculator which can be found right here:

    http://www.bulkreefsupply.com/reef-calculator

    Do you find this question helpful?  Yes   No

  • by michael on September 9, 2013, @1:58 AM

    Should GFO be changed just as often as Carbon?

    Bulk Reef Supply Hey Michael,
    GFO should be changed when it is depleted. How long this takes will depend on the amount of phosphate that is added to the tank. A pretty typical tank that would usually be 4-6 weeks or so but the best way to tell is to monitor the phosphates. When they start to increase that would indicate that DI resin has reached its capacity.

    Do you find this question helpful?  Yes   No

  • by John on April 6, 2014, @11:05 AM

    I have a biocube 29 and was wondering if this product can be used with some sort of a bag hanging in one of the back chambers of my tank? Will that be effective. I do not have the space or the recources to get a reactor.

    Thanks,

    John

    Bulk Reef Supply Hi John,
    It won't be as effective as a reactor and you will want to periodically knead the bag, but it would certainly be better then nothing.

    Do you find this question helpful?  Yes   No

  • by Jason on May 11, 2014, @7:59 AM

    How long should the GFO remain in the reactor? The fake stuff at the stores say 7 hours. Thank you for your time.

    Bulk Reef Supply Hey Jason,
    It depends on how much phosphates you have. The more you have, the faster it will need to be replaced and vice versa. As a whole though 4-6 weeks would be pretty typical. The best thing to do would be to monitor your phosphate levels with something like a Hanna phosphate checker. When the phosphates begin to rise that would indicate your GFO is used up and its time to change it.

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Full Details

GFO comes in two types:


  • Granular GFO is varied in its shapes and requires the least amount of flow to tumble. Good for reactors.
  • High Capacity GFO is twice as dense as Granular GFO, so twice as much material will fit into a reactor. It's extremely hard and has less dust to begin with. Fewer fines will be created during use and transportation. By volume High Capacity GFO will remove roughly twice the phosphate compared to Granular GFO. Best overall performance.

 

Special note on fighting existing algae problems: Algae needs three main nutrients to grow: phosphate, nitrate and light. Reducing any one of these will significantly slow down algae growth but many not completely solve your issue. Once algae takes hold, it can be a difficult battle but it is winnable. The best offense against algae is to take preventative measures and attack before an outbreak is apparent. Use the following suggestions and be aggressive if an algae problem is already present:

 

  • Maintain undetectable phosphate levels with good feeding habits and use of a phosphate remover like GFO.  99% of all phosphate is added via foods added to the tank.
  • Control nitrate levels by reducing feedings, increasing the water change schedule and maintaining a properly sized protein skimmer.
  • Use nutrient free RO/DI water for water changes and top off water
  • Shorten your lighting period or intensity. In some cases aquarists have found replacing old bulbs that have fallen out of their intended spectrum helps as well
  • Continuously remove as much algae as possible by hand.
  • Add predators nothing helps an algae outbreak as much as critters who eat it all day long. Various tangs, lawn mower blennies, crabs and snails are all good options. It is also theorized that a healthy pod population will also control algae growth before it gets a chance to take root.

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  • PRICE AND QUALITY By machote on 3/27/2015

    very good product i used to run a ATS (alggae turf scrubber) it was great but so much evaporation and maintenance needed each 7 days, also you need to design it very well and do a lot of research ( i spend a lot of hours? a lot of $ on light because u need a watt for gal now imagine in a 300 gal reef tank, also water splash etc, this gfo does the same but less work so then this is GREAT no maintance needed just replenish each month or month and a half
  • Great product By julius on 3/25/2015

    Good product I will keep buying good price
  • great stuff By donthavta on 3/7/2015

    I was watching Mr Saltwater Tank on u-tube ,he turned me on to bulk reef supply. I was having a big algae problem . He said to use BRS bulk Gfo in a reactor .The algae was out of the tank in 3 day /with light out . Wow this is the best my 15 year old tank has ever looker. Also it was a great price and was shipper very fast. Will buy all my need from BRS
  • incredable By ttboys on 2/15/2015

    wow this gfo works fantastic .I had quite a algae problem going ,but in one weeks time have reduced to almost none at all
  • Excellent By luis on 2/15/2015

    This works very well and I have only been using my gfo from brs. Very straight forward I run mine in a canister along with brs carbon in another canister I simply fill, install open my ball valve and rinse with tank water until dust particles at minimal or just until water comes out clear so it helps with a 1-2 gallon water change in my total 90g reef. Also I only have to change it every month and a half to two months on my bio load very good. Thanks BRS!
  • Good Stuff By Chris on 2/13/2015

    Started using this GFO in a BRS single reactor mixed with Carbon after having a green dust algae bloom in a newly established reef. I noticed differences the next day. Removing the phosphates completely killed off the algae within a week. Thanks for the advice BRS, good media!!!
  • great product By Andre on 2/4/2015

    It worked great for lowering phosphates... thanks brs!
  • Great! By Jason on 2/3/2015

    Great GFO at a great price, Can't go wrong here
  • So far so good By japicka on 1/31/2015

    I have this in a phosban 150 reactor along with the BRS lignite carbon, I am about a week in and once I got the flow right through the reactor I can tell an immediate difference. I was using seachem sea gel and it worked ok, but this combination works SOOO much better. Nuisance algae has been all but stopped. I used to have to scrape the tank sides about once a week, once I got this stuff up and running I can tell the growth on the glass has slowed WAY down. Phosphates were always pretty low in my tank, but this stuff has it basically at 0, or just above. I have not been running it long enough to probably get it all the way down yet. I not looking back I am going to run this stuff from now on.
  • Good Product By Jason on 1/22/2015

    Good Product
  • a must By Christopher on 12/24/2014

    This works wonders if you follow the instructions. I've been running it for close to a year now, and it is a staple for sure. You must use the correct amounts, and you must change it out. Don't expect results if you are to frugal with it.
  • Good Product By Wade on 12/23/2014

    Been using a cup of this in my reactor for about two weeks and i can already see a difference in my tank. Algae is almost gone. Phosphates are virtually at 0 now. I will continue using this product as long as I have an aquarium.

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