ReaXXion is a rockwool slab from Cultilene made for growers who want quick responsiveness and tight control over their irrigation and feeding schedules. It has a highly open fiber structure that offers rapid dry-backs and optimal air circulation around roots — making it ideal for shorter crop cycles and aggressive generative steering. This slab excels in high-frequency fertigation systems, with quick reaction to water input that allows you to fine tune moisture levels and deliver optimal oxygen and nutrient uptake to plant roots. ReaXXion is perfect for indoor grows or greenhouses where growers push plants hard for maximum yields in condensed timelines. If you’re looking for a slab with more moisture retention that offers a balanced approach, OptimaXX delivers a great balance of water and air. For longer cycles or bigger plants, MaXXima is a slab with more water-holding power for sustained root zone stability.