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I have been using phos-ban brand GFO for the last few months, but I am going to be switching to the two part brand granules in the next change of media. I did not like the phos ban brand because it's granules are too fine and they break up easily and travel out into the tank/sump. I don't know how the two part brand will be yet, but I'm hoping better, because I bought a whole gallon of it.
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