MarinePure: Anybody use it?

[hillegom]

Thanks for the thoughts.
Anyone else?
I have a lot of LR. Most very porous and light. When it was put in the tank at least. But I also have one piece that I really like the shape of. Unfortunately it is very dense, and heavy. I imagine if I had a sump, that a few pieces of this MarinePure, in the sump would counteract this dense piece of LR.