Hydor Co2 Green Nrg Natural System

[f1sh1275]

finding it hard to get the refils for this systestem can anyone suggest a recipie for it and what quantities of which ingredient i should be using

 

[DevUK]

I assume this is yeast based CO2 production? If so, see this sticky thread:

http/www.fishforums.net/content/Plants-a...sic-User-Guide/