What's up GC, I am going to be using two tents a small one for veg and one for flowering, I have read that a carbon filter is a must for flowering plants but i am unsure if I need one for the veg room? Any input?
You could try without the carbon filter in your veg tent and just see how things are. It depends on your situation.
I use a filter in my flower tent and an ona bucket in my veg/clone room. The bucket works somewhat, but not enough that im not going to add a second filter soon.