I run this in my BRS reactor and I noticed my hair algae dieing off within a week. It's a must for me.

Well this is some good GFO. Ive used all kinds in the past and this seems to be much more durable than the brands ive used. With the right reactor and flow this can last a long time and not cloud up.

Greatly reduced algae
Thants

Love this stuff! Easy to use and does the trick!

Great product, easy to use decent value

Use this to lower phosphates and in turn hair algea. I use it all the time in small quantities.

I purchased a PhosBan Reactor 150 filter from Bulk Reef Supply and bought this GFO. It has helped me reduce my phosphates and eliminate problem algae. Be carful not to use to much as it can reduce your phosphates below where you may want them.

Great price and it very little clumping. I will never go back to phosGuard after using this product.

Bought GFO with a BRS reactor and it works good. took care of my alge in 2-3 weeks, sweetness. Just wish i would have had GFO from the start.

I have been using this for a few months in my brs dual reactor. Im happy with the results but for my size tank i have to use the max amount for the reactor. Though more expensive its a slightly better value to use the high capacity gfo and use half as much in the reactor. But for a smaller tank this would be fine.

Bought this twice love it!

I've been using this gfo in a BRS reactor and my phosphates have disappeared. I'm very satisfied!

Excellent product. This product seems to be a slightly finer grain then other GFO's I've used. The price is right and it fluidized well in my reactor...

This stuff works better than the name brand stuff my LFS sells and there's much more here! Now i want to but a reactor to run this GFO and the carbon.

Works great. Much less expesive than the name brand stuff at the LFS and i think i works better.

I got this product after seeing many people using it on youtube, so far so good, my phosphates are nice and low and it works great in my phosban reactor 150

i always had a minor algae issue, but ever since i started using this gfo in my brs reactor 3 months ago i have zero algae problems. definately reccomend this

Was in the midst of a serious new tank Diatoms explosion. A friend recommended this product to use in my reactor and within a few days my issues was lessening.

this has worked the best for me

Like some other reviewers, I have used almost every brand of Granular Ferric Oxide (GFO) on the market over the years and BRS's Bulk GFO is undoubtedly the best for the price with very little sacrifice in performance. I give it 4 stars for performance because if you are willing to pay significantly more for other brands, they will perform very slightly better using the same amounts. I plan on purchasing BRS's High Capacity GFO when I run out of the "normal' capacity to compare. I anticipate that it will perform at or above that of the "premium" brands and the market (earning it 5 stars for performance), but costing approximately 33% more, will probably lower it's "value" score for me to 4 stars instead of this product's 5 (or even lower perhaps).

In my experience (15+ years at reef keeping), the use of GFO is way under promoted compared to its excellent utility. I have found it to be as fundamental for ensuring optimal conditions and parameters as are skimmers, calcium reactors (or kalkswasser/2 part solutions) or activated carbon (I know, I know... many don't use AC, but I'm a believer in its use also). Looking at the big picture, using GFO is one of the least expensive "costs" in being a continually successful reef keeper. It controls a vital parameter (PO4) that can cause devistation quickly and in low amounts.

An important caveat to remember is that many have observed deleterious effects by too quickly lowering high phosphate values, especially with SPS corals.

However, once you slowly get your PO4 to zero or near zero, consistent, continuous use of GFO will make your glass-cleaning magnet feel neglected!

I use BRS's GFO in a canister filter whose only other function is for pumping my aquarium's water through a chiller and holding small amounts of activated carbon. I keep both the GFO and carbon "sequestered" within the baskets of canister filter by using PURA Filtration Pads" (that I cut to fit with scissors) for the bottom and top most baskets. The canister filter also adds a little more water volume to the system.

The results of using BRS's GFO in this way have been outstanding. The only issue is that changing the media is a little tedious, so I'm very interested in trying out on BRS's "GFO Reactors", which appear to work under virtually the same principle, but should be much easier and quicker when it comes to changing out the media. If the price is right, the next review that you see from me may well be on one of those products (hint, hint BRS). ;)

From previous reviews here and on other sites, I am not quite sold on the "suspension-type" reactors due to the need for accurate flow adjustment (more maintenance) to keep the granules from either breaking each other up or from clumping too much). Although, clearly, their use would be far more efficient.

You will be impressed with this GFO.

This item lowed my phosphates slowly as advertised. I will be buying it again to be used with my reactor. Don't forget there is a calculator on the site that tells you how much to add to your system.

I use the BRS RO/DI, reactor and this GFO i have no.. zero alge issues. for the money it is the best deal i could find. and its nice not having to worry about if it works or not. Piece of mind!

works great. I had hair algae

already seeing decrease in competing alge in my display