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Title: What is this stuff?
Review: I had this nitrate remover in my fluval fx5 and it did nothing!! I have lots of fish but also have 2 other filters. Still nothing! Maybe it's just overcrowded because I also have tried purigen which is suppose to be better and that didn't work either! Im stickin to water changes now to keep up with high levels of nitrate. I am still using purigen in my fx5 and the nitrate remover cut to size pads in my other 2 filters but it's doing nothing! What a waste.
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