A few of the most widely used expanding media's include Rockwool, Light-weight Expanded Clay Mixture (referred to as, Hydrocorn or Improve Rock), Coconut Fiber/Coconut chips, and Perlite or Vermiculite. A few of the most generally applied developing media's contain Rockwool, Lightweight Expanded Clay Combination (named, Hydrocorn or Mature Rock), Coconut http://collinwyrv44666.blogadvize.com/165410/portland-hydroponics