I only trust my tanks to high-quality products. Because my system and my marine life deserve the best.

Works great! Brought my PO4 from 0.15 to 0.03 in hours. All I did was placed a small media bag near the return pump.

I bought this looking for a less expensive alternative. But you get what you pay for. This GFO works, don’t get me wrong. However the particle sizes are terribly inconsistent, there are large gravel size pieces all stuck together at the bottom of my reactor. They are too big to tumble so they just clump. There are medium size pieces similar to BRS brand tumbling a bit mid reactor. Then there are ultra fine particles that are constantly clogging the reactor lid. I never had this problem using BRS GFO. I would send the AF back if I could.

Had an off brand GFO before that couldn't get my phosphates below 0.20. This stuff knocked it down to 0.05 in just a few hours using a two little fishes reactor.

As a warning, the grain size is smaller than BRS's media bags. You can double or triple bag this GFO, but more than half of it will escape. You'll need a reactor that can handle fine grains. Sadly, it easily escapes through the foam on my reactor and a media bag is of limited use. If you have the right reactor, the price seems good.

Well, i used this for about 5 weeks, and bye bye HA. I decided to give this brand a chance and it has performed well. It takes time. Total system volume 95 gallon, 23 tablespoons in an Avast reactor. I also carbon dose a Zeo hybrid. Tried many types of GFO with minimal results. This or Two little fishies have done well under my tank specs. Will buy again.