BRS Bulk GFO Granular Ferric Oxide

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  • Remove phosphates from your tank with Granular Ferric Oxide

Quick Overview

Why does BRS recommend this?


Phosphates are going to be one of the biggest battles we have with a reef aquarium.  The BRS GFO works great in filter socks and reactors.  For the price Standard Granular GFO is going to be one of the best values when it comes to GFO for phosphate removal.


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

Why does BRS recommend this?

Phosphates are going to be one of the biggest battles we have with a reef aquarium.  The BRS GFO works great in filter socks and reactors.  For the price Standard Granular GFO is going to be one of the best values when it comes to GFO for phosphate removal.

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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Product Questions

How many cups in a pound of the BRS GFO?
Question by: Jeff on Jan 2, 2014 4:49:00 PM
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.
Answer by: Bulk Reef Supply on Jan 2, 2014 4:49:00 PM
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
Question by: James on Nov 19, 2013 7:22:00 AM
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.
Answer by: Bulk Reef Supply on Nov 19, 2013 7:22:00 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
Question by: Paul on Nov 27, 2013 10:19:00 AM
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.
Answer by: Bulk Reef Supply on Nov 27, 2013 10:19:00 AM
How do you know when it is time to replace the GFO in your reactor?
Question by: Ken on Jul 16, 2014 3:01:00 PM
Hi Ken,
The best way to know would be to test your water for phosphates using an easy to read phosphate meter like the hanna checker. When phosphates start to increase it would be a sign that the media is depleted and should be changed.
Answer by: Bulk Reef Supply on Jul 16, 2014 3:01:00 PM
If my tank is mainly sps dominated would this gfo work well? Or high capacity?
Question by: Sergio on Jan 17, 2016 10:45:00 PM
Great question!
Both will work well on your system! However the High Capacity is more efficient while using less space. The regular will take up more space. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jan 26, 2016 6:56:00 PM
Is GFO the same thing as phosban ? Can it be used in two fishes reactor ? Should it tumble in the reactor? thanks
Question by: GH on Aug 4, 2014 3:51:00 PM
GFO is Granular Ferric Oxide, it is the name of the actual material. Phosban happens to be just a brand name of a GFO product (among others). It can certainly be used in a phosban reactor and you do want to tumble it or it will clump together into a big rock.
Answer by: Bulk Reef Supply on Aug 4, 2014 3:51:00 PM
Does BRS GFO Granular lower alkalinity?
Question by: Jason on May 13, 2014 4:15:00 PM
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.
Answer by: Bulk Reef Supply on May 13, 2014 4:15:00 PM
Should GFO be changed just as often as Carbon?
Question by: michael on Sep 9, 2013 1:58:00 AM
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.
Answer by: Bulk Reef Supply on Sep 9, 2013 1:58:00 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
Question by: John Lasky on Mar 1, 2014 11:28:00 AM
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
Answer by: Bulk Reef Supply on Mar 1, 2014 11:28:00 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
Question by: John on Apr 6, 2014 11:05:00 AM
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.
Answer by: Bulk Reef Supply on Apr 6, 2014 11:05:00 AM
How long should the GFO remain in the reactor? The fake stuff at the stores say 7 hours. Thank you for your time.
Question by: Jason on May 11, 2014 7:59:00 AM
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.
Answer by: Bulk Reef Supply on May 11, 2014 7:59:00 AM

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.



Note: All Bulk GFO is packaged by weight

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  • Great Filter and A+ for service By Noe on 1/7/2016

    The container was damaged in shipping and BRS replaced it without any hassle. As for the media, I use it in my AIO to keep algae under control. Awesome filter
  • Life Saver By Joseph S on 12/19/2015

    I had a problem with Phosphates in my reef tank until now....Thank you BRS for this life line that makes it possible to have excellent water quality. You guys are the best and so are your products.
  • Good stuff By Kevin on 12/18/2015

    On my second 1/2 gallon. Removes phosphates and I don't have to worry about low quality. Thank you BRS for my awesome acros.
  • BRS Bulk GFO Granular Ferric Oxide By Mike565 on 12/11/2015

    I have been using this for years...change it out every two weeks and am very happy with the results.
  • Good stuff By Richard on 11/27/2015

    Works great with my BRS reactor
  • Amazing By Michael on 11/26/2015

    Works great, love this stuff.
  • Works very well By Pete on 11/20/2015

    I use the GFO in the BRS dual reactor with carbon. Works wonderfully! Would definitely recommend it to anyone looking to control phosphates.
  • very fine like powder. By Sean on 11/2/2015

    Works good at keeping phosphates down. I don't like how fine it is. Some can make it threw filter.
  • BRS Bulk GFO Granular Ferric Oxide By vapor160 on 10/15/2015

    Working just like it should. don't know why I didn't do this sooner.
  • Seems good. By clockman on 10/9/2015

    Like the title says. Seems like it does the job. I don't bother measuring phosphate in the water. I'm a bit lazy.
  • Works well! By Robert on 10/2/2015

    The only issue I have is that the GFO so fine that I have to keep the flow very low or use multiple filers not to get a lot of fines in my tank. Work well after finding a balance of flow and filter pads.
  • Great Product, Affordable Price By Robert on 9/15/2015

    I run this product in my reactor. Phosphate levels stay below detection. Water, rocks, and sand are algae free. I wouldn't run my reef aquarium without it!!! The best part is that a little goes a long way and it's not bad on the pocket either!!!

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