Cell Pore users, feedback please.

Please excuse the cross post, I am trying to get a cross section response to
my query.

I purchased a couple of sheets of cell pore when it was first on sale all
those years ago, thinking I would use it in my then marine tank. I never
used it and it is still in the packaging it arrived in. I am now in the
process of planning my new aquarium and am wondering how best to use it. I
will have a sump where I will be placing a deep sand bed. My thought was to
place the sheets under the sand to act as an extra area for denitrification.
Does anyone have experience of using it this way?

Thanks

Mark
www.marksfish.me.uk