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- BRS Bulk GFO Granular Ferric Oxide
Starting at: $44.99
Starting at: $39.99
Starting at: $24.99
Good stuff, a bit dusty By Ryan on 12/10/2014Ryan would recommend this product to a friendJust make sure you rinse it well before placing it in the system obviously. It does contain a fair amount of dust, but does the job once installed. No complaints here, you get a lot for what you pay for.
for the price By justyn on 12/4/2014justyn would recommend this product to a friendA great product for the price. I run gfo a long side my carbon and changing this product out gets expensive, once I found out about BRS I was hooked with them.
Excellent gfo for the price. By Roger on 12/3/2014Roger would recommend this product to a friendUsing this gfo has greatly helped me keep my p04 levels down to a minimum. Compaired to the expensive other brands it's crazy not to buy this stuff.
Good Prod By jawstone50 on 11/29/2014jawstone50 would recommend this product to a friendIncreasing the frequency off my GFO changes has decreased the speed at which my Hair Algae problem has returned. I will keep this frequency pace to hopefully completely eliminate the algae problem all together.
Great product, great price! By Jdubs on 11/24/2014Jdubs would recommend this product to a friendI run a 37 gallon heavily stocked with fish and LPS corals. This stuff removes phosphates FAST! Just make sure you use a reactor and don't just put it in a media bag you will never get the same results just running it in a media bag in a external filter. Keeps my reef looking pristine!
fair priced By mcbridepcm on 11/23/2014mcbridepcm would recommend this product to a friendI think it's a very reasonably priced media, I'm happy.
Great product By Travis on 11/18/2014Travis would recommend this product to a friendWhat can you say about this GFO? It works and at a great price.
Outstanding quality GFO By KEM on 11/14/2014KEM would recommend this product to a friendThis is my second batch of GFO Granular Ferric Oxide from BRS. Fantastic results in removing Phosphates. Would recommend it to anyone wanting a good GFO product
BRS knows how to make a good product!!! By Matt on 10/30/2014Matt would recommend this product to a friendThis stuff is the best I've been using it for two weeks and the phosphates are down to near 0 I'll never run a tank without this and they're dual reactor !!! Once again an excellent product by Brs
Great for small applications By Randy on 10/30/2014Randy would recommend this product to a friendIf you aren't burning through two cups of GFO every one to two weeks, then this is a great product, bang-for-buck wise!
What can I say... By blert on 10/27/2014blert would recommend this product to a friend...never though I would pay so much for a jug of pulverized rust. Maybe I shouldn't have sold that old car... Could have scraped it right off the bumper. LOL! Seriously though... It's good stuff and a decent price when compared to other products.
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
Previously Asked Questions
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 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 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 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 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 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 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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