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- BRS Bulk GFO Granular Ferric Oxide
Starting at: $44.99
Starting at: $39.99
Starting at: $24.99
Good Stuff By Christopher on 10/14/2014Christopher would recommend this product to a friendBeen using this GFO for over a year and it's good stuff. Keeps my phosphates in check with no problems. Lasts a decent amount of time before I have to change. A little bit of dust to wash out before starting a new batch. No issues with it breaking down as long as you keep the water flow moderate. Works great for me. Thanks BRS
Best GFO for the cost! By David on 10/2/2014David would recommend this product to a friendI tried several other products that claimed to clear up phosphate issues but none of them compared to the amazing results I have seen using BRS GFO. It is of the highest quality and the results show it!. The only GFO I will run through my reactor!
Great deal By Orlando on 9/29/2014Orlando would recommend this product to a friendI used this mixed with small particle carbon in my reactor, and works perfectly.
perfect By Kevin on 8/23/2014Kevin would recommend this product to a friendworks like all the other anti phosphate products at what seems like a quarter of the price.
Rinse it first By David on 7/30/2014David would recommend this product to a friendI did my homework when it came to adding chemical media in my reef. I have no complaints with this GFO. My Phosphates levels are always nearly undetectable and no algea, just make sure you rinse well before use.
Performs well - But needs to be rinsed Very Well By Alex on 7/19/2014Alex would recommend this product to a friendWe used the High Capacity GFO first and it worked great. This time we decided that since we had a large reactor and plenty of space, we could use the GFO that wasn't as compacted to be a little cheaper . It worked for its primary purpose - get the phosphate out. It's just that we had to rinse it with several gallons (5-10) of water to get the dust out and it still left orange dust on the bottom of my sump. I think we will go back to the high capacity stuff after we go through this batch.
top notch phosphate removal By swseipel on 7/6/2014swseipel would recommend this product to a friendThis has been a great asset to my water treatment system removing phosphate due to my overfeeding my tank
Low phosphates! By James on 7/1/2014James would recommend this product to a friendCleans the water like it says, put it in a reactor and let it work
Works Great By Christopher Kirkland on 6/25/2014Christopher Kirkland would recommend this product to a friendAs always works very well, and lasts a long time. Keeps the algae at bay and the PO4 down to levels my SPS like.
Lower Phosphate Levels! By Vincent on 5/25/2014Vincent would recommend this product to a friendWas experiencing Phosphate levels of .10 ppm set this up with the BRS dual reactor. After 24 hrs PO4 dropped to .05 ppm and after 48 hrs PO4 dropped to .01 ppm. Thanks BRS!
AWESOME! By Stephane on 5/23/2014Stephane would recommend this product to a friendI had problems with phosphates and every product i used temporary lowered my levels for only a few days, and even then only had them down to 0.04. I decided to order this product along with the BRS reactor and i am not disappointed. I had this stuff in for about 1 week and on the 2nd day, i had 0 and i mean 0 phosphates!
gfo By alfredo on 5/19/2014alfredo wouldn't recommend this product to a friendgreat stuff definitely lowers ur po4sl
Previously Asked Questions
by James on November 19, 2013, @7:22 AM
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.
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.
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:
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.
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.
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.
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.
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.
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.
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
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.
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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