Hydroton 50 liter bag

Grow Equipment Grow Mediums
1

How much do you need?

https://www.amazon.com/Hydro-Crunch-Expanded-Hydroponic-Aggregate/dp/B012TUG4J4/ref=sr_1_4?ie=UTF8&qid=1497385822&sr=8-4&keywords=hydroton+expanded+clay?tag=greenrel-20

2

that’s what ive been using for years. it does work awesome I have had great luck with it

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3

Hydroton is the best medium. It is a bit expensive but, once you have it, you can sterilize it between grows by soaking in a leaching product such as Flora Kleen or any same product by another company.