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They state it's a porous ceramic material with water passing capabilities. Pore structure engineered to distribute water flow through the media evenly, from their site. Wondering if anyone has tried these products. Vida Rock has good feedback, I haven't found any negative feedback. In fact I'm waiting on the delivery of VidaRock purchase. I went back and ordered the small 1 inch cubes to add to the sump for more bacterial colonization, if I'm reading this right. Otherwise more to add to the fish closet...