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

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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
Hi, can you place the standard GFO in a media bag then place into a media reactor to reduce the fines released into the water.
Question by: Marc Upton on Jun 1, 2016 12:59:00 PM
Certainly can however for best performance the GFO should be rinsed before hand and have a sponge on top so it can tumble. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jun 2, 2016 12:18:00 PM
On 6/22 my phosphorus reading was 3 ppb. On 6/23 reading was 8 ppb, so I started running my BRS GFO reactor. On 6/25 reading was 12 ppb.Today it's 15. Should I change out the gfo? I removed 60 lbs. of sand on 6/20 to reduce nitrate & algae. Thanks
Question by: Terry Dangler on Jun 28, 2016 1:10:00 PM
Great question!
Depending o the changes occurring in the system you may need to change the GFO if the phosphate continues to rise. In systems with more phosphate the GFO will certainly deplete much faster and will need to be changed. Major tank changes can stir up a lot of left over waste which may contribute to the excess levels.
Answer by: Connor (Admin) on Jul 1, 2016 9:53:00 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
Does your BRS GFO have a shelf life?

Thanks,
Jose
Question by: jose palomino on May 23, 2016 8:07:00 AM
Great question! The GFO has no shelf life, so long as you keep it dry, it should last indefinitely.
Answer by: Carter (Admin) on May 25, 2016 2:59:00 PM
I run a 90g tank, I just purchased the dual reactor, and was curious why I can't just put 2 cups in the reactor instead of 1.5 cups.
Question by: David Barr on Apr 27, 2016 8:31:00 PM
Great question!
The recommended amount of GFO is 1.41 in accordance with our instructions and the reef calculator. We recommend running the correct dosage when ever possible as it will limit the impact as well as be much easier to tune and tumble.
Answer by: Connor (Admin) on Apr 28, 2016 10:50:00 AM
How many gph should I run through the GFO for a 40 gallon tank
Question by: Arvard Fowler on Jul 16, 2016 10:50:00 PM
Hi there,
The GPH through the reactor will need to be set for the volume of GFO so that it has a slight simmer at the top of the GFO in the reactor. If the GFO if not moving it may turn into a brick pretty quickly, or if the tumble is too vigorous then it will end up as as dusty fines from tumbling against itself too hard.
Answer by: Charlie (Admin) on Jul 18, 2016 10:27:00 AM
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
I am trying to understand how much flow should go through GFO. Should there be enough flow to where the whole column of GFO is slightly tumbling or just enough to where only the surface is tumbling?
Question by: Evan Chandlee on Mar 21, 2016 5:46:00 PM
Great question!
There should ideally be enough flow to keep the entire column tumbling to prevent clogging. If clogging occurs try removing some media and adjusting the flow. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Mar 22, 2016 11:16:00 AM
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
Can I use BRS Bulk GFO Granular Ferric Oxide for freshwater
Question by: Andrii Bat on Aug 17, 2016 5:49:00 PM
Hey Andrii,
You can use gfo in both salt and freshwater, it will remove p04 the same.
Answer by: Jason Smith (Admin) on Aug 18, 2016 2:55:00 PM
Is there any aluminum in this? My new toadstool hasn't opened In 3 weeks.
Question by: Patti on Jun 11, 2016 9:08:00 PM
Great question!
This does not contain aluminum and from our use throughout the years unless overdosed to shock the system GFO does not tend to have a negative impact. Feel free to let us know if you have any further questions!
Answer by: Connor (Admin) on Jun 14, 2016 5:53:00 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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  • Works Great By Greg on 8/24/2016

    Good value, & quality
  • This stuff really works! By Bobaloo on 8/8/2016

    This product really performs when used in a reactor and will last at least a month in my 91 gallon system. My phosphates are no longer a worry for this reefer!
  • Awesome product By Great results on 7/28/2016

    I should have installed a reactor a long time ago.
  • i love this product By Aquanerd on 6/25/2016

    .i watched a few of your videos and review videos from your customers. i had a lot of problems with my phosphate and this product would help with it.so there was nothing to loss this would have been my last draw. i ordered the BRS GFO Reactor, as well with the GFO. When i started to use this product with in 24 hours my phosphate was zero....i have worked for years trying to get this down to zero i have used different things over the years and nothing works better then this stuff.THANK YOU THANK YOU THANK YOU.i have never had a problem since.My phosphate still sits at zero.
  • Excellent quality and value By KeithN on 6/5/2016

    Cheapest gfo and works great clean high quality products as always idk how the competiters are still in buisness!
  • Outstanding product By DeMario on 6/5/2016

    I placed GFO in both my reactors on my two salt water tanks. One fish only the other a 20 gallon long reef tank. My phosphates went down to 0 ppm. Never had that happen till now.Highly recommended for any reefer.
  • Good stuff By Jim on 6/1/2016

    Works as advertised.
  • Good stuff By Nick on 5/10/2016

    Good stuff
  • good price for the quality By sod on 5/6/2016

    great service and customer support
  • BRS Bulk GFO Granular Ferric Oxide By jerry on 5/5/2016

    Excellent product
  • Works Great By RudyEnt on 4/20/2016

    I have been using this GFO for about a year now. I use it along with the ROX carbon on all my tanks. I have had great results from it and see no reason to change what works. I did try the high capacity one when this one was on back order a while ago and I did not see a big difference on performance. Then again my tank is very stable I should not see that much of a difference. I do change it every month along with the carbon so I don't get to push it to its limit. It is not expensive so I see no reason to push it. On occasions it has run for longer than a month as I have been away on business and my readings did not change so it does last longer than the month.
  • Drops PO4 fast By June on 4/19/2016

    Thoroughly love to watch our PO4 go down to near zero/zero. We need to feed frozen food 2x a day and this helps to keep our PO4 in check!