Plagron Cocos Premium is ideal because of its structure a perfect base substrate. 
It is, of course, and fully buffered at a stable pH-value. Cocos Premium contains Trichoderma against malicious mold protection. 
It is particularly suitable for fast-growing plants. 
Cocos Premium meets the most stringent quality requirements and contains no fertilizers. Cocos Premium also has the RHP quality mark

Hydrological grow with stable pH.
Fully buffered substrate with stable pH.
Rinsed with fresh water for high quality.
Guaranteed to be the best-washed coconut substrate on the market.
Guaranteed low EC value .

RHP approved.