Are there different styles of Gro-Slabs? Did the names of the slabs change?

GRODAN Gro-Slabs were previously available in two different stone wool weaves; vertical fibers (previously called Expert) and horizontal fibers (previously called CLASSIC). All GRODAN Gro-Slabs in the newer platinum packaging have vertical running fibers except for the 12” Gro-Slab – which has horizontal fibers. The vertical fibers allow for faster drainage (drier slabs) than the horizontally run fibers (wet slabs). The stone wool inside the newly packaged GRODAN Gro-Slabs are the next generation Expert slabs which are up to 5% dryer. This slight adjustment in the stone wool weave has proven to improve overall yield in commercial greenhouse growing.