Don't use the pharmacy h202, that shit will mess with your ph, and it is not cost effective.. You should make a trip to a big city near you and stock up on hydro supplies. But if you have a chiller (which you do) you dont need the h202 as much as me who also has an aeroflo but no chiller. The h202 keeps my roots healthy while giving me an extra boost of oxygen, which I can use cause I am growing at 5000 ft elevation..more pics please!