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It will not release back phosphates under aquarium conditions.
It depends on how large your tank is. The easiest way to do the math is to use our reef calculator at the link below. You enter the size of the tank and the type of GFO you want to use, it will tell you how much GFO to add.
For a tank that size you would want to run 1 cup of GFO. The easiest way to do the math is to use the BRS Calculator right here:
The GFO HC is a denser/harder product which means it can handle more flow without breaking down (though at the same flow, its tumbling characteristics would be about the same). If you are trying to increase flow you could also remove the sponge pads in the reactor when using GFO.
It sure will. Its a great combo if you need something that is hang on back!
It is a good idea to rinse GFO quickly with tank water to wash off any small dust. Feel free to let us know if you have any further questions!
GFO will help to remove silicates from the water slightly. It sole purpose however is for phosphate removal.
Overall you will use our aquarium calculator to find the correct amount between 2.5 cups for regular GFO and 1.25 cups for High Capacity. With this said you can use a single reactor for High Capacity and a larger reactor would be needed for the regular GFO. Feel free to let us know if you have any further questions!
There will be 8 cups in a half gallon container.
It is best when tumbled in a fluidized bed reactor as the media otherwise has a tendency to harden into a brick, but even placed in a filter sock would be better then nothing.
There isn't any minimum size limit to the high capacity gfo. It can be used in any aquarium it just happens to be more popular in larger tanks because you don't need as much media. Its handy when your trying to keep the equipment smaller while still maintaining the same effect.
Two Types of GFO:
- 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 the same volume of 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 may 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 nutrient 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 a phosphate remover like GFO. 99% of all phosphate is added to the tank via foods.
- 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.
Worth the money By Adam on 6/26/2016Adam would recommend this product to a friendQuick to rinse, works great.
dan would recommend this product to a friend By dan on 6/14/2016dan would recommend this product to a friendVery good product.
BRS Bulk GFO Granular Ferric Oxide - High Capacity By Ernie on 2/6/2016Ernie would recommend this product to a friendVery good product
Good, but not great By Chas on 1/19/2016Chas would recommend this product to a friendThis stuff works pretty well. It rinses clean very easily but it is not removing phosphate as quickly as RowaPhos. It is less expensive and easier to use, so it will probably be good for maintenance, not leaching precipitated phosphate from your rock.
Great Product By KEITH on 12/27/2015KEITH would recommend this product to a friendThis is one of many products that the saying "you get what you pay for " fits well
Love it By Hamburg on 12/14/2015Hamburg would recommend this product to a friendworks great nice clean water
Runses clean By percula99 on 12/7/2015percula99 would recommend this product to a friendI prefer the high capacity GFO because it rinses clean almost immediately. Less messy than regular GFO and really removes phosphate.
Magic By randy on 11/18/2015randy would recommend this product to a friendBRS GFO high capacity works great on my tank. Nuisance algae is gone since I'm using this brand with BRS dual reactor. Just follow the recommended dosage and you're good to go.
Necter of the gods!!! By Reefinman on 11/18/2015Reefinman would recommend this product to a friendThis stuff is great!! Keeps the algae in check. My tank never looked so good.
Worth the money, works incredibly well By Amy on 11/10/2015Amy would recommend this product to a friendBought this product to help 'rehab' a neglected tank. Phosphates were through the roof, too high to register with our Hanna checker (over 2.50ppm). Added HC GFO to a BRS dual reactor and saw IMMEDIATE results. Within 72 hours phosphate levels were well below 0.5ppm and still falling.
Needs no real rinsing, just let the first little bit of water that leaves the reactor flow through some floss and a filter sock, to collect the fines (or discard the water). Tumbles beautifully in a reactor, we've had no issues whatsoever with clumping or pieces breaking down into fines.
Lastly, when compared to regular GFO, this stuff is denser; at first glance it looks WAY more expensive, but compared by weight it's not a huge difference and it's worth it. We use regular GFO for maintaining non-problem tanks, but if you have a high-load tank, you're dealing with a major phosphate issue, repairing long-term neglect, it's worth laying out the cash for this stuff -- it's not a gimmick, it definitely works more intensely than the standard GFO.
Highest quality GFO I've ever found By Adam on 11/9/2015Adam would recommend this product to a friendNo clumping, huge capacity, easy to work with, and keeps my phosphates in check like nothing else I've ever used. I really can't say enough about this product other than it is the best I've ever found. Period.
BRS Bulk GFO Granular Ferric Oxide - High By steve on 9/6/2015steve would recommend this product to a friendnitrates were high 10ppm then two weeks later 0ppm wow You need to get this now.