I am currently using these media chambers for charcoal, GFO, matrix stones and polishing pads. None of my reef aquariums have ever been this clean. I definitely attribute at least some of that to the ability to stack materials in these chambers. However, I had to slightly modify the top of the acrylic where the water flows in. I had to cut out some acrylic so the water level wasn't as high as it was. The water level was so high that the salty creep was very bad. They worked, but the constant salinity on the tank wall was suboptimal.
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