When do u use carbon dioxide or do u use it all the way through veg and bloom??? also how many times a day do i need to water??? i have 30 plants under 3 600w sodium lamps and growing in canna coco using canna coco nutrients in a drip irrigation system, temp is about 85-90. EC is aroud 1.3and ph is 6 plants are about 2 weeks old from seed about 2-3 inches tall. thanx!!!!

I don't know about the coco and water, you shouldn't need much it holds alot of water. C02 is used during light hours of flowering and only if you have enough light, like MH or better HPS. It will do you no good with fluro's. Temp sound a little high and so does EC but I never worked with coco.

I don't know if this will help you or not. I'm using CO2 to adjust ph and it's been working beautifully. To ph down I add CO2 and water. I bought a soda club soda maker. To ph up I add ro or tap water (that has been standing to get rid of chlorine). My ph stays real consistent and I only ph adjust once a day. Sometimes I can skip a day. But generally it's once a day.

Plus I got a milwaukee meter that mountain man recommended and it's great. I just put the probe in the nutrient solution. At a glance I can determine if I need to ph up or down. Very simple.