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- BRS Bulk GFO Granular Ferric Oxide - High Capacity
the best By Shaun on 5/6/13Shaun would recommend this product to a friendThe best gfo by far. Worth the extra money from tge regular gfo to the high capacity
Works just as they said it woud By Bill K on 4/19/13Bill K would recommend this product to a friendJust added GFO in my new BRS dual reactor .Works just as they said it woud .Great product and great veideo to help set up with the tubling of GFO.
Great stuff By David on 4/14/13David would recommend this product to a friendI have used both regular and HC GFO. I went with the cheaper regular last time and have regretted it. I highly recommend this product it lasts longer and requires less product to sufficiently do the job.
As good as the quality gets and great price for it By tyvek on 4/11/13tyvek would recommend this product to a friendVery good quality and the price is very good too.
Helped remove all the hair aglae in my tank By Justin on 4/1/13Justin would recommend this product to a friendI have used this twice on an off over a number of years, I had a pretty bad hair algae issue and I tried everything, after months of extracting and using phosphate removal stuff, I couldn't get rid of the algae. After adding this back in it took a little while, though no more algae.
I still get the green hue on the glass, though it takes longer now before it appears.
Awesome Product By Toby on 3/26/13Toby would recommend this product to a friendI am using a brand new 6 stage BRS RO/DI unit with 150gpd upgrade and booster pump. Yet, I still get a light brown/green haze on the glass daily. I only feed frozen Mysid and Frozen Formula 1 every other day making sure not to over feed. With the exception of shrimp to the BT Anenome and and DT's to the corals. No hair algae or anything bad but that dang haze. Well Folks! No More! I added BRS High capacity GFO (by BRS Calculator) in the BRS GFO reactor and it was cleared by the next day! Actually it's been 3 days and I just went over the glass and really still didn't need it. Awesome Stuff! I only regret not adding this day 1.
Essential part of process to eliminate algae By Darcy on 3/7/13Darcy would recommend this product to a friendI don't know why I didn't use this stuff sooner. Algae was growing faster than we could remove it. Instead of enjoying our reef tank it was becoming a burden. My phosphates were always on the high side but changing our feeding practices and adding cheato to the sump never seemed to substantially change the high readings.
I set up a reactor and added High Capacity GFO from BRS. The phosphate readings dropped markedly but the algae stuck around. It was less prolific and pale looking but it was still there. So, on the advice of a fellow reefer, we obtained a sea hare and let it go to work. After 3 weeks virtually all my algae was gone. We added a fresh batch of GFO to the reactor my readings stayed where I want them at about .04 and there's no resurgence of algae. It's been over 6 weeks with no trace algae and my corals have more color to them. Hopefully, we have this licked.
When I consider all the work we went through prior to this I don't know why we dragged our feet implementing GFO to our system. BTW, no sea hare was harmed in the removal of the algae. Once there was no more algae to consume our LFS gladly gave us store credit for the returned sea hare.
Awesome By ROB B on 2/28/13ROB B would recommend this product to a friendI strongly recommend this product!!! And i strongly recommend BRS they have excellent customer service!!
AWESOME!! By Nathan on 2/22/13Nathan would recommend this product to a friendUse this in a BRS Reactor and it works perfect, i use less than the amount needed and it still keeps my phosphates down
Another great BRS product. By JABlacher on 2/4/13JABlacher would recommend this product to a friendNeed to get your phosphates back in check? This is definitely a fix then. The key to using this GFO is to be regular in changing it and the correct flow through your reactor. A light wave in the surface of the media and changing it out after about 2 weeks works wonders for my tank. Thanks BRS for another great media!
Good but not perfect By John on 12/7/12John wouldn't recommend this product to a friendLike most reefers, I use BRS because it's the best when it comes to a whole slew of aquarium parts/additives/equipment. The prices are right, the products are great, blah blah blah.
But I was/have been a little disappointed by this Ferric Oxide - High Capacity. The reasons being two fold...I think that there is a lot more dust and residue in the batch than can be rinsed out with a reasonable amount of water. The result is that your reef is cloudy for a day or two, and the skimmer pulls out what I'd consider to be A LOT of ferric oxide from the water column over the next 2-3 days. Some of you might be thinking "turn down the flow in the reaction chamber", but enough flow to make the ferric oxide tumble is enough to make the tank cloudy with the stuff (even after rinsing).
My second gripe with the product is that it forms itself into a solid block inside the reaction chamber that is really tough to remove. And the flow is not too low either because as I see flow going down I increase the power of the MJ 1200 with a valve and the stuff still forms a brick in the reactor.
Granted, like most things, it's cheaper to get it on BRS than say getting rowaphos, but I like this product better for my tank.
Still I gave 3 stars because it kept phosphates at 0, just the other two factors matter a lot to me. I know for a fact that it's not good for clams to filter ferric oxide out of the water. I almost lost a deresa clam because I didn't rinse my rowaphos once.
Much better than regular GFO By Aron on 11/29/12Aron would recommend this product to a friendThis is a much cleaner, longer lasting GFO than the other standard one that BRS offers. Yes it is more expensive but you get a lot more lifetime out of it and I think there is less tumbling that grinds the GFO particles into smaller pieces and eventually dust. Also out of the box after filing up the reactor there is less dirty water coming out of the reactor which is a plus.
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Previously Asked Questions
by CHRISTOPHER on April 8, 2013, @4:04 PM
How do I prevent the gfo from turning into a very hard solid?
Bulk Reef Supply Hey Christopher,
GFO will naturally clump up. To prevent this you want to run it in a fluidized bed reactor which will slowly cause the media to move and tumble, preventing the clumping.
by Jim on March 10, 2013, @1:04 PM
How do you determine the quantity of gfo to be used and how often is it changed?
Bulk Reef Supply Hey Jim,
The easiest way to to tell is to cheat and use the reef calculator which does all the math for you :-) I will link it below. GFO just needs to be changed when its capacity has been used up. How long that takes depends on how much phosphate you add to the tank. Most people find it lasts 4-6 weeks but if you are adding a bunch of phosphates it will be less and vice versa.
by Linda on January 16, 2013, @8:23 PM
We are always fighting some kind of algea. Right now GHA has appeared in the tank. Our water tests always test out great and we do a 20 gallon water change every 2 weeks (90 gallon tank and maybe 15 gallons in sump). We use RO water also. Will your product help even though our test for phosphate is 0? I don't use a reactor, so would it work as well in a media bag? Our reef tank (softies) is 4 years old. Thank you.
Bulk Reef Supply Hey Linda,
Algae is always frustrating to deal with! I would suggest running the GFO media in a tank now and in the future for a couple of reasons. The first and foremost is that keeping phosphates down will help remove a food source for algae, and that in turn can help keep it from getting out of control. Phosphate also reduces calcification in stony corals, slowing their growth.
When the algae is already established in the tank its not unusual to see the measured levels at or near 0. The simplest way to describe why this happens would be to say that the algae is simply just eating it as fast as it is entering the water. By running GFO you can take some of those phosphates that would be available to the algae away. You can also increase its effectiveness by manually removing the algae, which will allow the GFO to remove more the phosphate that would otherwise be consumed by the algae.
GFO does work best in a reactor as a reactor helps to prevent channeling and will keep the GFO from clumping up or solidifying, though even in a media bag it will be better then not having it at all :-)
by tammy on October 15, 2012, @8:56 AM
how many cups comes in the 1.75 pound jar . thanks
Bulk Reef Supply It is right about 4 cups.
by laura on March 17, 2013, @4:57 AM
How often should you change out the carbon and GFO media?
Bulk Reef Supply Hey Laura,
Carbon should be changed every two weeks. GFO only needs to be changed when it has reached its capacity, this will vary from tank to tank depending on the amount of phosphates that are added but its typically in the ballpark of 4-6 weeks or so.
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 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 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.
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