CANNA COGr Buffering Agent is a special liquid that is used to soak and buffer the COGr boards. CANNA developed this agent especially for the preparation of this growing medium.

COGr Buffer Agent for soaking the COGr substrate.
COGr nutrition also contains pH-stabilisers, silicon, humic and fulvic acids. COGr in combination with COGr growing medium is the nutrient for the experienced and demanding grower.