A number of the most generally applied increasing media's include Rockwool, Lightweight Expanded Clay Aggregate (named, Hydrocorn or Improve Rock), Coconut Fiber/Coconut chips, and Perlite or Vermiculite. Some of the most widely used increasing media's consist of Rockwool, Light-weight Expanded Clay Combination (identified as, Hydrocorn or Develop Rock), Coconut Fiber/Coconut http://cruzozed32109.blogoscience.com/145274/pakenham-hydroponics