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Two Little Fish Phosban Review

Synthetic ferric oxide hydroxide granules with an extremely high capacity for adsorbing phosphate from saltwater and freshwater. Also adsorbs silicate, and does not release adsorbed substances. Recommended for long-lasting and easy control of phosphate levels on a permanent basis. Available in 150g, 454g, 1200g and 6000g.

Rather than using aluminum oxides for phosphate reduction, Phosban is made of ferric oxide hydroxide. Aluminum oxides does remove phosphate, but isn’t ideal for a reef tank because it often leaves enough phosphate in the water for nuisance algae and it contains aluminum.

Phosban is completely ree safe and won’t release anything!
It binds nearly 3x more phosphate by weight than wet ferric hydroxide adsorbents.
Phosban ships dry which makes us save on shipping and there are no cautions about its storage.

Flow rate is important with phosban. It will not receive enough flow by having it in a media bag. Not enough flow will cause it to “clump up” making it less efficient. For that reason, you should definitely get a phosban reactor. A reactor allow you to push about 80-90 GPH through the phosban which is I think the best flow rate.

They recommend 1 gram for each gallon of water. It’s a hard to tell how long it will last. Each tank is going to need changing at differing intervals. To make things easy, change the media when your phosphates begin to rise again.
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Rating: 3.3/4 (1 vote cast)

Comments (10)


  1. I use it when it’s time to fight algae.

  2. [...] If you are using Phosban, you might want to get a Phosban Reactor because flow rate is important with phosban. It will not [...]

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