It is basically the same thing..... "fracted, stable porous clay" As per your original request, it is basically Seachem Flourite, but very inexpensive in comparison. It is NOT meant to be covered with another material.....How does this flourite work as opposed to that seachem flourite? I have no experience with either and it seems like something you would use as a base layer and cover with gravel/sand?
http://www.seachem.com/Products/product_pages/Flourite.html
Best of luck with your set-up!
Dennis