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CANNA COGr Buffer Agent is a special liquid that is used to soak and buffer COGr boards. CANNA developed this agent especially for the preparation of the COGr growing medium. Each slab makes 21-25 litres of coco when decompressed. A litre pack of COGr Buffering Agent dilutes up to 500 litres - one application per crop. ALso available in 1L & 5L