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A reverse-flow filter, like the phosphate reactors, is the most efficient way to use the media if you are willing to tune the flow. The fluidization effect will increase the percentage of media that comes in contact with the water. The flow needs to be slow enough that the media isn't ground into powder.
Otherwise, a normal-flow reactor is good. I don't know that a bag in the sump would get enough flow forced through it, but it might work.
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Jonathan Bertoni
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