i used tap water and just adjusted the PH. seemed to work fine.

As for the vent, use a light trap. basically anything with a 90 degree bend. You may be able to use a 4" PVC elbow or metal venting from the AC dept at home depot.
yamaha_1fan Reviewed by yamaha_1fan on . First Grow Room - A Couple ?'s Hey all, I've been reading up on this forum a lot in the last month and it has really helped me in setting up my grow. Currently, I have 12 Snocap clones in my veg room under a 1000W MH bulb. I just purchased them yesterday and planted them last night. I'll have pics up of everything later today. We're planning on doing a SCROG grow as we only have about 5' to work with. I have a couple quick questions though: 1. I've heard that you should use r/o H20 to water your plants, how about water Rating: 5