I'm in hydryton and everyone who gets to the point of co2 i know of are doing hydro with hydryton/or rockwood and useing air stones maybe Zandor got some ideas on soil and Co2. I'm talking about sealed off rooms with co2 emmitters or a tank controlled with auto gauge, the consentration of Co2 is to high for the roots not shure what you are useing and in what...... :smokin: