The Grodan Uni-Slab is a growing medium designed to house larger plants and support them throughout their lifecycle. Featuring all the benefits of a traditional Grodan Rockwool slab, now with UV wrapping that makes transportation easier and contains moisture and nutrients longer than a traditional slab. The Uni-Slab is perfect for busy growers looking to reduce time watering plants or new growers looking to experiment with Rockwool slabs.