The nutrients the plants need are provided by the nutrient solution, and is what the growing media is watered and moistened with. Some of the most widely used growing media's include Rockwool, Lightweight Expanded Clay Aggregate (called, Hydrocorn or Grow Rock), Coconut Fiber/Coconut chips, and Perlite or Vermiculite.) 

BB Hydro Australia has a range of Brands including, Cyco, Hy-Gen and Canna just to name a few. 

Grow Mediums

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Cyco Hydro Clay 50LT

Substrate

$29.95 $50.00
Hydro Clay 25LT

Substrate

$15.00 $50.00