You can use molasses in a hydro system...it's very diluted for plant use (1 or <1 tablespoon/gal. water) and doesn't really clog anything up....at least not from my experience with hydro.

co2 you want to dump on top of the plants as a gas, so don't put yeast and sugar in your solution res!!!
TANKJR Reviewed by TANKJR on . why co2???? I keep hearing about people adding co2 to their grow room and or tent. What is this for and is it needed? Rating: 5