Fluval Clearmax Phosphate Remover Filters, 3.5 Ounces - 3-Pack

I have used this product a few times. It is now sold and packaged in a blue box as Fluval Clearmax by Hagen.

When it was Green-X / Phos-X, the media bags were long and thin. With the new packaging they fit the canister filters much better as they are now shaped square.

The product seems to work well enough for me for my marine tank. I have to condition tap for my water changes.

It is difficult to say whether or not there is a real reduction in nitrate. My param seems to remain steady at the low end with regular water changes, but who knows what it would be if I wasn't using it at all?

I acquired fish with closed operculum gills. I wrote to Hagen to ask about the iron content to see if it would be okay for my fish because of the type of gills they have, to which they responded it contains ferric oxide; not okay to use for fish of that type.

I am having to switch to a brand that will not harm my species of fish.(Regular ChemiPure or PhosBan using ferric oxide hydroxide).

While I used this product, I had no complaints. The price was very good compared to other adsorbents and algae remained under control.

I use Fluval Clearmax to condition tap water before water changes. I fill a 5 gallon tank running a small filter using Clearmax with tap water and run it 24 hours minimum. The chlorine off-gasses and the Clearmax reduces the phosphates. It is necessary to change the Clearmax after every fifth refill (25 gallons treated). Then I use the preconditioned water for water changes in my 40 gallon tank. Before adding the Clearmax to this routine I would get dreadful blooms of brown algae. When I first started adding the treated water there was a brief ammonia spike from the algae die-off, but it soon stabilized as my tank was well cycled, with good nitrite and nitrate readings prior to introducing the treated water. I have (gianormous) goldfish, tough as nails, so I cannot speak to it's effect on more delicate species.

I do think using it to treat the water before adding it to the tank, rather than putting it in the live tank filter, may reduce it's impact on the fish, as there is a small amount of black precipitate in the conditioning tank which I do not move to the live tank. I assume the precipitate is primarily iron.

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Remove this product during disease treatments. Even various water treatments can cause the ferric oxide to leech out, poisoning your fish. I lost 14 fish after using this during a treatment of parasite medication (only one fish presented with problems prior to treatment). I stopped using it for several weeks. I returned it to filter and noticed the same problems starting to happen again while using a product that is supposed to boost immunity. Something in that product was causing the ferric oxide to leech out as well. Fortunately, I recognized what was happening, removed the Clear Max and did several water changes. I was able to save most of my fish.

I recommend using a product that does not contain ferric oxide to control phosphates if you are unsure how it will react with other products you use. This product does provide crystal clear water but fish health is much more important. I was using it for a 20 gallon freshwater aquarium.

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I did not buy this from amazon, and it comes in a new box at the LFS called Clearmax. I found this out the hard way, but this stuff is lethal to certain types of fish and I was using a little less than 50% of the recommended amount. Now it does trap phosphates, nitrites and nitrates as it states on the box. Water tests are coming up practically zero for each range but at the cost of many fish. Arowanas are especially sensitive to this stuff. Please be careful when using. I will never use this stuff again. I bought it thinking it would help remove some phosphates from a freshwater tank with an algae bloom issue when all i really needed was a UV clarifier/sterilizer. I had no issues with the fish before using this stuff other than some algae bloom. I do weekly water changes and all the water tests were good.

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