Grodan Uni-Slab Grodan Uni-Slab can support large plants throughout their lifecycle. Allowing greenhouse and indoor growers to realize excellent production levels per plant. It also affords extra physical stability for top-heavy plants and additional protection from algae and root pests thanks to its UV-resistant cover. Expert Slabs is the slab that drains the fastest because of its vertical fibers. By far the most popular slab for the hydroponic hobbyist market. In addition, the top layer is thicker, which stays wetter, while the bottom layer stays drier. In effect it defies gravity, allowing more even distribution of moisture throughout the slab.
