Google search "lava rock grill", the cheap stuff from home depot is what I am talking about. Looks like red+brown porous rocks.
I agree, if you have a sump it would be counter-productive to remove it. Might as well use it if you got it! More water is always better.
I agree, if you have a sump it would be counter-productive to remove it. Might as well use it if you got it! More water is always better.



