Well, since I've been busy with stuff, tell me (I'm really lazy about reading directions) do I need a big CO2 tank to use it with the meter. I've got the small tank used to make soda pop. I'ts from the soda club and it says it will make 110 liters of soda. I am exlusively using CO2 and couldn't be happier. It's great and the plants are loving it. Lush, white roots. I really need to look at the meter tomorrow. The only problem is I have two separate containers for hydro. I would probably need two controllers. One for each. I'm still working out the bugs on my grow. Just moved them outside to natural sunlight and they couldn't be happier. I'll probably need to get a bigger container for hydro or connect them.

Thanks for posting this great idea mountain.