- Home /
- BRS Bulk GFO Granular Ferric Oxide
Starting at: $24.99
Starting at: $44.99
Starting at: $39.99
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
Great product just dusty By Christopher on 5/11/2014Christopher would recommend this product to a friendI have used this GFO for a few months now and have had no issues other than the typical dust that comes with all gfo products. I just run 2 gallons of ro water through it and have no complaints!
Great product that does what it says By Eric on 5/7/2014Eric would recommend this product to a friendThis stuff is great and absolutely reduced my phosphates. I've also used the high capacity. The bulk gfo does clump quite a bit and produces dust. I buy the high capacity now with no problems. Great stuff though.
Good Value...but needs frequent changing By Daniel on 5/3/2014Daniel would recommend this product to a friendThis media is a great value, the cost is well worth it for the performance it provides. The only reason I didn't give it a five was for the fact that it solidifies faster than the BRS High Capacity GFO when dosing 2-part.
Awesome product By Jonathan on 4/30/2014Jonathan would recommend this product to a friendI have no idea why I have not started to run this in my aquarium my corals started to open better after I started to run this in the BRS Dual Reactor. This stuff works great and it last a long time as well. Also I started to see some algae growth and after a week it started to disappear.
would recommend to do friend By Bryan on 4/19/2014Bryan would recommend this product to a friendGreat product 2 days after adding gfo to aquarium my phosphate dropped to 0. The algae also disappeared from the aquarium also.
Ask a Question About 'BRS Bulk GFO Granular Ferric Oxide'
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 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 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.
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 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:
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.
Deal of the Day!
BRS 150 GPD Water Saver Upgrade KitEnds in
Regular Price: $59.99
Special Price: $53.9900:00:00:00
- Bulk Media & Additives
- Bulk Reverse Osmosis Filters & Systems
- Bulk Dry Live Rock & Live Sand
- BRS Additives
- hw Wiegandt
- Korallen-Zucht Additives
- Red Sea Additives
- Two Little Fishies
- Fauna Marin Aquarium Additives
- Auto Top Off Systems
- Filter Media
- Fish & Coral Foods
- Fragging Supplies
- Heaters & Chillers
- Aquarium Lighting
- Medications & Pest Removal
- Monitors & Controllers
- Protein Skimmers
- Sumps, Tanks & Refugiums
- Tank Maintenance & Salt Mix
- UV & Ozone
- New Products
- BRS Apparel
Send us your feedback
Let us know.
Phone Hours: 7am - 7pm CST M-Th
10am-4pm CST Friday
6325 Sandburg Road, Suite 400
Golden Valley, MN 55427 Map
View Larger Map 6325 Sandburg Road, Suite 400, Golden Valley, MN 55427