I always thought hydroton was fine also. Although their is a particular article where the guy gets 1.5 G/W and he used CoCo slabs in a Drain To Waste system, with like i forgot 10-15 clones per sq/ft. Which was about 400 power plant clones in a small area. I forgot what nutes he used, Im talking about the one out of the bible. The baddest G/W ive seen and only dream about getting. i mean 1.5. DAMN!!