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.
Gen Reviewed by Gen on . Question about CO2 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!!!! Rating: 5